This section reviews congruent triangles.

Triangles are congruent when all corresponding sides and interior angles are congruent.

Explore properties of congruent triangles using the link below. Be sure to follow instructions when you come to a "Try this." The last section you need to look at is "Imagine the triangles are cardboard."

Congruent Triangles

• Did rotation of the triangles affect the size and shape of the congruent triangle? Answer: Interactive button. Assistance may be required. _____ no
• Did reflection of the triangles affect the size and shape of the congruent triangle? Answer: Interactive button. Assistance may be required. _____ no

In order to show congruent parts in figures, the congruent parts are denoted with tick marks across the side or across the arc of the angle.

Use ΔABC and ΔDEF as pictured below to match corresponding parts for the two congruent triangles. Drag the labels on the right to the appropriate places in the statements below to describe the congruent corresponding parts of the triangles.