Unit 3, Lesson 11# More About Similar Triangles

EngageNY 45 min(s)

Students present informal arguments as to whether or not two triangles are similar. Students practice finding lengths of corresponding sides of similar triangles. Students use what they know about dilation, congruence, the fundamental theorem of similarity (FTS), and the angle-angle (AA) criterion to determine if two triangles are similar. In the first two examples, students use informal arguments to decide if two triangles are similar.