Answers Grade 7 Mathematics Area of a Circle — QuizQuestion 5

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Area of a Circle — Quiz

Question 5 • Grade 7 Mathematics

Geoffrey needs to find the circumference of a circle. Which process should he use?

Answer

A

He should square the radius and then multiply the result by 3 point 1 4 .

B

He should multiply the diameter times 2 and then multiply the result by 3 point 1 4 .

C

He should square the diameter and then multiply the result by 3 point 1 4 .

D

He should multiply the radius times 2 and then multiply the result by 3 point 1 4 .

Explanation

The circumference of a circle is found with C = 2πr, where r is the radius. So Geoffrey should multiply the radius by 2, then multiply by 3.14. This is choice D. Squaring the radius or diameter is used in area calculations, not circumference.

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