Lesson: Similarity of Triangles Mathematics • Second Year of Preparatory School

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In this lesson, we will learn how to determine and prove whether two triangles are similar using equality of corresponding angles or proportionality of corresponding sides and how to use similarity to find unknown lengths and angles.

Lesson Plan

Students will be able to

identify and prove the similarity of two triangles due to two pairs of corresponding angles equal in measure,
identify and prove the similarity of two triangles due to corresponding sides having the same proportion,
write the similarity statements of two similar triangles,
use the similarity of two triangles to find unknown angles, unknown lengths, and perimeters.