# Congruent Triangles

- Author:
- Isabelle Hoadley

## Congruent triangles

In order to tell if triangles are congruent you need three pieces of information about sides or angles.
There are four rules for congruent triangles which will be explored in the worksheet below.

## Exploring sides and angles of congruent triangles

In the apps below there are two triangles. Measure the sides and angles and determine if the triangles are congruent. You can find the tools for these in the menu above the triangles.
The measure button is the one that looks like an angle of a triangle. In this drop down menu you can select all measurements including angle magnitude (first in the menu) and side length (third).

## Testing Triangles

Were the side lengths of both triangles...

Were the angles of both triangles...

Do you think these triangles are congruent? Why?

## Testing Triangles

Are the angles of the following triangles...

Are the side lengths of the following triangles...

Are these triangles congruent?

Do you think that just using angles is a good determinant of congruence?