Triangle congruence worksheet (with answer key)

Shapes such as triangles, Circles, and polygons are widely thought of throughout the elementary grades. How about let’s try to understand more about the most basic shape which is the triangle and its congruency? On this worksheet, you will learn how to tell if the given triangles are congruent or not.

What is a triangle?

Triangle is a three-sided polygon that has three edges and three vertices. It has three angles that measure 180 degrees combined and any of its two sides must be greater in length than the other one. 

What is triangle congruence?

Two triangles are said to be congruent if all three corresponding sides are equal and all three corresponding angles are equal in measure. These triangles can be slid, rotated, flipped, and turned to be looked identical. If repositioned, they coincide with each other. The symbol of congruence is’ ≅’

How will it help you understand the triangle and its property?
This worksheet will help you better understand congruent triangles by explaining their conditions and giving out examples.

Instructions on how to use this math worksheet

to carefully study the triangle congruency by giving its conditions and providing examples. 5-item activities are given after the lesson to exercise the learned concept. Towards the end of this worksheet, a reflective section is provided to help the learner think about their thinking (metacognition) and assess how they performed in the lesson.


At the end of this worksheet, it is expected that the learner will understand how to tell if the triangles given are congruent or not.

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