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# GB GT2

last edited by 10 years, 5 months ago

Home > Learn GeoGebra -> G.Bautista GeoGebra Tutorials -> GB-GT2 Constructing an Equilateral Triangle

## #GeoGebra Tutorial 2 – Constructing an Equilateral Triangle

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 Guillermo Bautista November 9, 2009

Problem: How will you draw an equilateral triangle without using the Regular polygon tool?

If this is your first time to using GeoGebra, it is important that you read Introduction to GeoGebra. You can follow this tutorial step by step by opening the GeoGebra window.

In this tutorial, we will mimic compass and straight edge construction using the circle tool.  The idea is to use the intersections of two circles and the two centers to form as triangles as shown below. Click & drag A, B (or a=AB or the triangle itself). Notice that the triangle is always equilateral!

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Figure 1 - An equilateral triangle formed by radii of two circles

In constructing our triangle, we are going to learn how to use the circle tool, and how to display interior angle measure of a polygon and length of segments. Note that we can also draw a regular polygon of any side by using the Regular polygon tool.