We have learned that the area of a parallelogram is the product of its base and its height, and the circumference of a circle with radius is . To find the area of a circle with radius , divide it into congruent sectors (blue and red divisions) then arrange them as shown below. Figure 2 […]

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# Elementary School Geometry

## GeoGebra Basic Construction 3 – Right Triangle

In this construction, we use the Perpendicular Line tool to create right triangle ABC where angle B is the right. First, we construct segment AB, then construct a line perpendicular to segment AB and passing through B. Then, we construct point C on the line, hide the line and connect B to C as well […]

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## Area Tutorial 3 – Area of a Parallelogram

In the previous area computation tutorials, we have learned how to compute the area of a rectangle and the area of a triangle. In this tutorial, we are going to learn how to compute the area of a parallelogram. In Figure 1, we have parallelogram ABCD with given base and the dashed segment as its […]

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