Geometer’s Sketchpad Essentials 2 – Constructing a rectangle

This is the second tutorial in the Geometer’s Sketchpad Essentials Series. In the first tutorial of this series, we used Geometer’s Sketchpad to construct medians of the triangle and found out that the medians intersect at a point. In this tutorial, we are going to learn how to use parallel and perpendicular lines to construct a rectangle.

Figure 1 - The rectangle construction after step 11.

Step by Step Instructions

1.) Open Geometer’s Sketchpad.

2.) Construct a segment using the Segment tool.

3) Select the Text tool and click the two points to create their labels. These points are named A and B. » Read more

August GeoGebra Seminar Reminders

To those who are planning to attend the seminar on August 13, 20, and 27, please note of the following reminders:
  • The seminar is only for Filipino teachers teaching secondary and tertiary level in the Philippines. (I included this because we have been receiving online registration from other countries. My apologies for the confusion.)
  • We only have 25 slots available. The seminar is on a first come first serve basis and only paid participants.
  • Deadline of registration is on August 10, 2011.
  • Participants are required to bring their own laptops.
For more information click the links below:
Contact Information 
  • For questions about GeoGebra and the GeoGebra training, please contact gipmanila@gmail.com, or call 9274276 local 203.
  • For questions about payment, contact nismed_up@gmail.com, call 9274276 local 212 or 111, or call +639216423163
  • For questions about hostel accommodation questions, contact upnismed_hostel@yahoo.com, call 9274276 local 102 or 118, or call +639184202745.

The Multiplication Parabola

In the graph below, move points A and B such that they are on opposite sides of the y-axis.  What do you observe?

[iframe http://mathandmultimedia.com/wp-content/geogebraapplets/multiplicationinparabola/parabolamultiplication.html 500 400]

Theorem: Given two points on the function f(x) = x^2, whose coordinates are (a,a^2) and (b, b^2) with a < 0 and b > 0, the y-intercept of the line passing through these points is -ab. » Read more

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