## GeoGebra Essentials Series

The GeoGebra page is getting very crowded. As part of my de-cluttering program this weekend, I am splitting the GeoGebra tutorial page into different pages. So, you can expect more list posts. My apologies. I have changed the date to January 1, so that it will not be displayed on the front page.

GeoGebra Essentials Series

Introduction to GeoGebra

This is the introduction to GeoGebra. It contains discussions of the different parts
of GeoGebra and the advantages in using it. It also points you out to the system installation requirements and the website where you can download it.

Last Update: 16 October 2015 (GeoGebra 5.0)

GeoGebra Essentials 1 – Locating the Triangle’s Centroid

In this tutorial, you will create a triangle and find the intersection of its medians.  In doing the tutorial, you will learn how to use the following tools: new point, segment between two points, midpoint or center, intersect two objects and move.

Last Update: 13 October 2015 (GeoGebra 5.0)

GeoGebra Essentials 2 – Constructing a Rectangle

In this tutorial, you will learn how to create a rectangle using the segment tool, as well as the parallel and perpendicular line tools.  You will also learn how to measure the length of segments and angles.  In doing the tutorial, we are also going to discuss semi-free objects.

Last Update: 14 October 2015 (GeoGebra 5.0)

GeoGebra Essentials 3 – Triangles, Incircles and CircumCircles

In this tutorial, you will show that in any triangle, a circle can be created that passes through its three vertices. You will learn that you can always create an inscribed circle.  The circle that passes through the three vertices of a triangle is called the circumcircle of the triangle, while the circle that inscribed in it is called its incircle.

Last Update: 20 October 2015 (GeoGebra 5.0)

GeoGebra Essentials 4 –Angles, Lengths and Object Properties

In this tutorial, you will use GeoGebra to investigate if a relationship exists between the interior angles of a triangle and the lengths of its sides. You are going to learn two new tools – the Angle and the Distance or Length tool.

GeoGebra Essentials 5 – The Compass Tool and the SSS Congruence

In this tutorial, you will mimic compass and straightedge construction using GeoGebra’s compass and segment between two points and ray through two points tool. You will use the concept of the SSS congruence; that is, you will show that if the three corresponding sides of a triangle are congruent, then the triangles are congruent.

GeoGebra Essentials 6 –Sliders and Rhombuses

In this tutorial, you will construct a rhombus using two sliders – the angle slider and the number slider. The slider the slider tool.  A slider (see figure below) is a dynamic graphical representation of a number.

GeoGebra Essentials 7– Using the Keyboard Commands

In this tutorial, you are going to learn how to construct mathematical objects using keyboard commands. You will learn how to construct an equilateral triangle by mimicking compass and straightedge construction.

GeoGebra Tutorial 8 – Graphs and their Properties

In this tutorial, you will learn the basics about graphing and how to use GeoGebra command to get the critical points of a function. You will also learn how to graph trigonometric, exponential, and logarithmic functions.

GeoGebra Essentials 9 – Texts and Variables

In this tutorial, you are going to learn how to use the text tool of GeoGebra. You will learn about constants and variables and we will learn how to concatenate them in GeoGebra text codes.

GeoGebra Tutorial 10 – Exporting Your Document

In this tutorial, you are going to learn how to export GeoGebra worksheets to static graphics format.  This way you would be able to use the diagrams in different documents such as articles, blogs, exams, problem sets, and other articles.

## GeoGebra Intermediate Tutorial Series

In this tutorial, you will use GeoGebra to investigate the properties of the polygon formed by connecting consecutive midpoints of the sides of a quadrilateral. In this construction, you will use the following tools: New PointSegment between Two PointsMidpoint or Center, and Polygon, Distance tool and Angle tool.

GeoGebra Tutorial 2 – Constructing an Equilateral Triangle

In this tutorial, we mimic compass and straightedge construction by using radii of two congruent circles to construct an equilateral triangle.  The tools that we will use in this tutorial are New PointPolygonCircle with Center through Point.

This construction is similar to Tutorial 2, mimicking the compass and straightedge construction. In this tutorial, you will use the circle, perpendicular line, and parallel lines tools to construct a square. The tools that you will use in this tutorial are New PointCircle with Center through PointSegment between Two PointsPerpendicular Line and Parallel Line.

GeoGebra Tutorial 4 – Graphs and Sliders

In this tutorial, you will learn how to use the input bar to graph linear functions.  We use the GeoGebra slider to show the effects of the values of m and b to the graph of the function y = m x + b.

GeoGebraTutorial 5 – Discovering the Pythorean Theorem

In this tutorial, you will investigate the relationship among the areas of the squares formed by the three sides of a right triangle.  The tool that will be used in this tutorial are Perpendicular LineSegment between Two Points and Regular Polygon.

GeoGebra Tutorial 6 – Parameterization of Area and Length of a Rectangle

In this tutorial, you will learn how to write equations, formulas and perform computations in GeoGebra. You will construct a rectangle with a fixed perimeter and a variable length. You will graph the ordered pair (length,area) of a rectangle with a fixed perimeter in the xy-plane and find the dimensions with the maximum area. The tools that will be used in this tutorial are new point,perpendicular lineparallel line, andpolygon.

GeoGebra Tutorial 7 –  Sliders, Rotation and the Angle Sum Theorem

In this tutorial, you will use the slider and the rotation tools to replicate triangles, rotate them and show that the angle sum of a triangle is 180 degrees. The tools that  we will use in this tutorial are Line through Two Points, Midpoint or CenterPolygonSlider, and Rotate Object around Point by Angle.

GeoGebra Tutorial 8 – Tracing Graphs of Trigonometric Functions

In this tutorial, you will trace paths of points formed by points on the Cartiesian plane. You will graph  (d,x) and (d,y) where d is the distance traveled by a point along the circle from (1,0) and  and y are its and y-coordinates. The tools that you will use in this construction are new pointcircle with center through point, and circular arc with center through two points.

GeoGebra Tutorial 9– Vector and Translation

In this tutorial, we will use the vector tool to translate a triangle. We will explore the relationship among the coordinates of the pre-image of an object, the object of its image, and the direction and magnitude of the vector. The tools that we will use in this tutorial are new point,polygon, vector between two pointstranslate object by vector.

In this tutorial, we will use the strategy that we have learned in the Vector and Translation tutorial to tile a plane with regular octagons and squares. The tools that we will use in this tutorial are newpoint,polygon, vector between two points,translate object by vector and regular polygon.

GeoGebra Tutorial 11 – Sliders and Graphs of Trigonometric Functions

In this tutorial, you will use the slider to investigate the effects of the parameters a, b, c and d in the graph of the sine function f(x) = a sin(bx -c) + d. You will also explore the cosine and tangent functions. You will learn how to use check boxes to show and hide the graphs. The tools that you will use in this tutorial are slider and check box to show/hide objects.

In this tutorial, we will learn how to insert text and picture in GeoGebra. We will use the protractor image to measure the angle formed by two segments.   The tools that we will use in this tutorial are line through two points, segment between two points, angle, and semicircle through two points.

GeoGebra Tutorial 13– How to Use Latex in GeoGebra

In this tutorial, you will learn how to embed Latex in GeoGebra worksheets. Latex is a typesetting program capable of constructing complicated mathematical formulas.  It is widely used by mathematicians in creating scientific documents.  It can also be embedded in websites and is integrated in many mathematics programs.

GeoGebra Tutorial 14 – Circle Area Approximation by Inscribed Polygons

In this tutorial, you are going to inscribe a polygon in a circle, increase its number of sides, and see the relationship between the area of the circle and the area of the polygon as the number of sides increases.  This strategy was done by mathematicians in ancient time to approximate the area of a circle.

GeoGebra Tutorial 15 – Tangents, Circles and Circumscribed Polygons

This tutorial is a continuation of GeoGebra Tutorial 14. In this tutorial, we are going to compare the areas of the circle, its inscribed polygon which we constructed in Tutorial 14 and its circumscribed polygon.

GeoGebra Tutorial 16 – Slider, Sequence and Segment Division

In this tutorial, we are going to learn how to use the slider control and the sequence command to divide a segment with an arbitrary length into n equal partitions.

GeoGebra Tutorial 17 -Tangent and the Meaning of Derivative

In this tutorial, we are going to construct point A on a function, and construct a line tangent to the function and passing through A. We are also going to plot a point whose x-coordinate is is the x-coordinate of point Aand the y-coordinate is the slope of the tangent line. We are going to get the derivative of the function and relate it to the path of the second point.

GeoGebra Tutorial 18 – Area Under a Curve and the Riemann Sums

In this tutorial, we are going to compare the area of a plane under a curve f(x) = x2 bounded by the x-axis and the line x =1 with the sum of the areas of rectangular partitions under the same boundaries.

GeoGebra Tutorial 19 – Introduction to Spreadsheet

In this tutorial, we are going to use the Record to Spreadsheet tool to record the coordinates of a moving point along the graph of a particular function.  We will graph the function f(x) = x2, construct point P with coordinates(a,f(a)) , where a is a value from a slider. We will record the coordinates of the traces of P .

GeoGebra Tutorial 20 –Spreadsheet, Slider and Curves of Best Fit

In this tutorial, we will use the spreadsheet window to input coordinates of points that will be plotted in the coordinate plane.  We will use the Best Fit Line tool to construct a line of best fit of the plotted points. Finally, we will also use the Fitpolycommand and the slider tool to construct polynomial (with varying degrees) curves of best fit.

GeoGebra Tutorial 21 – Spreadsheet and Similarity

In this tutorial, we will construct a constant number k, in the form of a slider, and see what happens if we multiply the coordinates (x1,y1), (x2,y2) and (x3,y3) of the vertices of our triangle by k. We will investigate if there is a relationship between the original triangle and the triangle formed whose vertices have coordinates (kx1,ky1), (kx2,ky2) and (kx3,ky3).

GeoGebra Tutorial 22 – Spreadsheet, Vectors, and Matrices

In this tutorial, we are going to explore the relationship between the product of two 2 x 2 matrices. We will set the entries of the factor matrices to integers, and limit the second matrix entries to values of -1, 0, and 1. We will also observe the relationship between their graphical interpretations, known as vectors.

GeoGebra Tutorial 23– Spreadsheet, Bar Chart and Histogram

In this tutorial, we are going to use the spreadsheet to perform basic data representation.  We will plot a frequency table of  grouped data and perform basic computations using the spreadsheet window.  After the data is completed, we will construct a histogram.

GeoGebra Tutorial 24– Box and Whiskers

GeoGebra Tutorial 25– The Rolling Circle

In this tutorial, we are going to use GeoGebra in constructing a rolling circle. This way, we would be able to relate the diameter of the circle to its circumference. Moreover, this activity will reinforce the relationship between the angle and radian measure.

GeoGebra Tutorial 26– Constructing a Cycloid

This tutorial is very similar to the Tutorial 25. In this tutorial, we are going to use GeoGebra to construct a cycloid.A cycloid is the curve defined by the path of a point on the edge of circular wheel as the wheel rolls along a straight line.

GeoGebra Tutorial 27– Animation and Epicycloids

In this tutorial, we are going to rotate a circle about the center of another circle tangent to it using the animation feature of GeoGebra. Along the rotating circle, we will also rotate a point on its circumference about its center (see red point in the diagram). The path of this point is called the epicycloid.

GeoGebra Tutorial 28– Animation and Hypocycloids

In this tutorial, we are going to construct a hypocycloid using GeoGebra. A hypocycloid is a special curve generated by the trace of a fixed point on a small circle that rolls within a larger circle.

GeoGebra Tutorial 29– Animation, Loci and Radian Measure

In this tutorial, we are going to introduce the concept of radian.  We are going to rotate radius AB’ about point A, the center of the circle. As the point rotates, point C goes back and forth from A to B’at the same speed as that of C. The path of point traces forms petals.

GeoGebra Tutorial 30 –  Loci, Roses and Reflections

In this tutorial, we are going to reflect a point on a circle about the x -axis and about the y -axis to form rectangle ABCD. We will construct a segment passing through pointB where one of the endpoints on the center and with length equal to the area of a circle. As we move the point B along the the circle, the trace of the end point of the segment (not on the circle’s center) will form a 4-petal rose.

GeoGebra Tutorial 31 – Paper Folding Simulation

In this tutorial, we are going to use GeoGebra to simulate paper folding. We will represent a rectangular piece of paper with corners ABCD and drag the upper right corner (vertex B) anywhere inside the rectangle. We will use the Point in region tool of GeoGebra 4.0 Beta Release (or New Point tool in 3.2) to construct the figure.

GeoGebra Tutorial 32 – Graphing Piecewise Functions

In this tutorial, we are going to use thefunctioncommand of GeoGebra to graph piecewise function

$f(x) = \begin{cases} 1-x, x \leq 1 \\x^2, x > 1 \end{cases}$ .

We will manually create the endpoints and the arrows.

## GeoGebra Tutorial 22 – Spreadsheets, Vectors, and Matrices

This is the 22nd tutorial of the GeoGebra Intermediate Tutorial Series. If this is your first time to use GeoGebra, you might want to read the GeoGebra Essentials Series.

In this tutorial, we explore the relationship between the product of two 2 x 2 matrices. We set the entries of the factor matrices to integers, and limit the second matrix entries to values of -1, 0, and 1. We will also observe the relationship between their graphical interpretations.

First, we enter values of the first 2 x 2 matrix in cells A1, B1, A2 and B2, then create the multiplier matrix determined by sliders a, b, c and d. We enter the formulas of product matrix cells in E1, F1, E2 and F2. The ordered pairs (A1,B1), (A2,B2) are the factor matrix and the ordered pairs (E1,F1) and (E2,F2) will be the product matrix.

You can view the output of this tutorial here. » Read more

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