Area of a Circle — Quiz Answers

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1
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Elspeth knows that pi times r almost equal to 9 point 4 2 cm. What would she need to do to find the circumference?

A
She could divide 9 point 4 2 by 2 to find the radius, and then square the radius.
B
She could divide 9 point 4 2 by pi to find the radius, and then multiply 9 point 4 2 by the radius.
C
She could multiply 9 point 4 2 by 2 .
D
She could multiply 9 point 4 2 by pi .
2
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The diameter of a circle is 8 inches What is the area?

A
64 pi in squared
B
32 pi in squared
C
8 pi in squared
D
16 pi in squared
4

The diameter of a circle is 10 meters What is the area of the circle? (Use 3 point 1 4 for pi and round to the nearest tenth.)

A
62 point 8 m squared
B
31 point 4 m squared
C
125 point 6 m squared
D
78 point 5 m squared
5

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

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 .
6

Sarah only knows the diameter of a circle. What should she do to find the radius?

A
Divide the diameter by 2 .
B
Multiply the diameter by pi .
C
Multiply the diameter by 2 .
D
Divide the diameter by pi .
8

A circle has a circumference of 2 pi cm. Which statement about the circumference and area is true?

A
A comparison of the area and circumference is not possible since the area cannot be determined.
B
The numerical value of the circumference is less than the numerical value of the area.
C
The numerical values of the circumference and area of the circle are equal.
D
The numerical value of the circumference is greater than the numerical value of the area.
9

What is the area of a circle with a radius of 1 foot ?

A
pi ft squared
B
1 fourth pi ft squared
C
2 pi ft squared
D
1 half pi ft squared
10

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

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 .

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Area of a Circle — Quiz Answers — Grade 7…