Mathomat V3

# How to Copy an Angle without a Compass

video tutorial part
17
of

## Learning Geometry with a Circle Arc Template

with

### Chris Tisdell

Mathematician & Educator

### Materials you will need:

Mathomat V3 Template
Unlined Paper / Scrap Paper
Sharp Pencil/s
Fine-point Pen/s
Eraser

### What you will learn in this tutorial:

In this video, Chris Tisdell shows how to copy a given angle CDE onto a given line segment AB. He uses a circle arc template and a straightedge. He forms an isosceles triangle whose base angle is angle CDE and has base DF. He then cuts off a segment AE from AB that is equal to DF. Finally, AE is bisected, forming a triangle that is congruent to the original triangle. This means that the corresponding angles to each triangle are equal and so we have copied the original angle over.

### Chris Tisdell

Mathematician & Educator
Chris, a mathematician and educator, is an academic advisor to Mathomat. Chris approached us in 2021 with an interest in the circle templates in Mathomat...
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