This Instructional Activity is a part of the Lesson 19, Unit 7, Grade 8. What do you think the formula to find the volume of a pyramid is? Explain. Ask students to share their response to part (b) of Exercise 2. If students do not see the connection between cones and cylinders to pyramids and prisms, then use the discussion points below. A pyramid is similar to a cone, but a pyramid has a polygonal base and faces that are shaped like triangles.