Lesson Plan: Similarity of Triangles Mathematics • Second Year of Preparatory School
This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students 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.
Objectives
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.
Prerequisites
Students should already be familiar with
- the angle sum of a triangle.
Exclusions
Students will not cover
- formal names for conditions of similarity of triangles (, , and ).
