Back to Exercise: Circumference and area

Circumference and Area of Circles

Grade 10·22 problems·~30 min·ACT Math·topic·act-geo-circ-circumarea

Work through problems with immediate feedback

A

Recall / Warm-Up

1

A circle has a diameter of 14 cm. What is the radius?

A.

7 cm

B.

14 cm

C.

28 cm

D.

3.5 cm

2

What is the perimeter of a square with side length 8 cm?

A.

16 cm

B.

32 cm

C.

64 cm

D.

24 cm

3

What is $7^2$ ?

B

Fluency Practice

1

A circle has radius 5 cm. What is the circumference? Express your answer in terms of $\pi$ .

2

A circle has diameter 18 in. What is the circumference in terms of $\pi$ ?

A.

$9\pi$ in

B.

$18\pi$ in

C.

$36\pi$ in

D.

18 in

3

A circle has radius 6 cm. What is the area? Express your answer in terms of $\pi$ .

4

A circle has diameter 10 m. What is its area?

A.

$100\pi$ m²

B.

$25\pi$ m²

C.

$10\pi$ m²

D.

$50\pi$ m²

5

A circle has radius 9 cm. What is the circumference? Round to the nearest tenth. (Use $\pi \approx 3.14159$ .)

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