3, Lesson 21, Unit 5, Grade 8, OpenUp icon
Instructional Activity

Sphere’s Radius

Lesson 21. Unit 5. Grade 8 Open Up Resources

Open Up Resources5 min(s)

This Instructional Activity is a part of the Lesson 21, Unit 5, Grade 8. The purpose of this activity is for students to think about how to find the radius of a sphere when its volume is known. Students can examine the structure of the equation for volume and reason about a number that makes the equation true. They can also notice that Pi is a factor on each side of the equation and divide each side by Pi. Both strategies simplify the solution process and minimize the need for rounding.

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