Lesson: Similar Polygons Mathematics • First Year of Secondary School

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In this lesson, we will learn how to use the properties of similar polygons to find unknown angles, side lengths, scale factors, and perimeters.

Students will be able to

recognize that if two polygons are similar, then they contain angles of equal measure and corresponding sides that are in proportion,
use proportionality of sides to prove similarity,
use similarity to calculate unknown angle measures, scale factors, unknown side lengths, and perimeters,
use similarity of polygons to solve real-world problems.