10
QuizMultiple Choice

Area of a Circle — Quiz

Question 10 • Grade 7 Mathematics

Min knows that pi times r almost equal to 9 point 4 2 cm. What would she need to do to find the area?

Answer
A
She could divide 9 point 4 2 by pi to find the radius, then multiply 9 point 4 2 by the radius.
B
She could divide 9 point 4 2 by 2 to find the radius, then square the radius.
C
She could multiply 9 point 4 2 by pi .
D
She could multiply 9 point 4 2 by 2 .

Explanation

Since πr is about 9.42 cm, divide 9.42 by π to find the radius. The area is πr², which is the same as (πr) times r, so multiply 9.42 by the radius you found. Choice A describes these steps.

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