How to Construct a Right Isosceles Triangle With Compass

Sometimes you will need to draw an isosceles triangle given limited information. We use one of those 45 degree angles to get the result we need.


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It works by constructing an isosceles right triangle which has interior angles of 45 45 and 90 degrees.

. See the proof below for more details. This page shows how to construct a line parallel to a given line that passes through a given point with compass and straightedge or ruler. An isosceles triangle is a triangle with two equal side lengths and two equal angles.

It uses this in reverse - by creating two equal corresponding angles it. If you know the side lengths base and altitude it is possible to do this with just a ruler and compass or just a compass if you are given line segments. It is called the angle copy method because it works by using the fact that a transverse line drawn across two parallel lines creates pairs of equal corresponding angles.

This page shows how to construct draw a 45 degree angle with compass and straightedge or ruler.


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