Unit 5, Lesson 4# The Area of All Triangles Using Height and Base

EngageNY 45 min(s)

Students construct the altitude for three different cases: an altitude that is a side of a right angle, an altitude that lies over the base, and an altitude that is outside the triangle. Students deconstruct triangles to justify that the area of a triangle is exactly one half the area of a parallelogram. Students need the attached templates, scissors, a ruler, and glue to complete the Exploratory Challenge. Draw and label the altitude of each triangle below.