5, Lesson 21, Unit 3, Grade 7, EngageNY icon
Instructional Activity


Lesson 21. Unit 3. Grade 7 EngageNY

EngageNY5 min(s)

This Instructional Activity is a part of the Lesson 21, Unit 3, Grade 7. The surface area formula for a right rectangular prism cannot be applied to a right triangular prism. Why? The formula adds the areas of six rectangular faces. A right triangular prism only has three rectangular faces and also has two triangular faces (bases). The area formula for triangles is the formula for the area of rectangles or parallelograms.

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