Finding Circumference and Area of a Circle Practice

30π in

a. Find the circumference of a circle with a diameter of 30 inches, in terms of π.

94.2 in

b. Find the circumference of a circle with a diameter of 30 inches, to the nearest tenth.

14 π cm

c. Find the circumference of a circle with a diameter of 14 cm, in terms of π.

44.0 cm

d. Find the circumference of a circle with a diameter of 14 cm, to the nearest tenth.

6 π in

e. Find the circumference of a circle with a radius of 3 inches, in terms of π.

18.84 in

f. Find the circumference of a circle with a radius of 3 inches, to the nearest hundredth.

284 ft

g. Find the circumference of a circle with a diameter of 90.5 feet, to the nearest foot.

35π m

h. Find the circumference of a circle with a radius of 35/2 (fraction) meters, in terms of π.

73.5 cm

i. The radius of a paper plate is 11.7 cm. What is the distance around the plate, to the nearest tenth of a centimeter?

10 cm

j. If the radius of a circle is 5 cm, what is the length of the diameter?

5 cm

k. If the diameter of a circle is 10 cm, what is the length of the radius?

9.5 cm

l. If the diameter of a circle is 19 cm, what is the length of the radius?

16 cm

m. The area of a DVD is about 64π sq cm. What is the DVD's diameter?

10 in

n. The area of a circular garden is 100π square inches. What is its radius?

153.86 sq in

o. What is the area of a 14" diameter stationary bike tire?

38.465 sq yd

p. The Ryan family is building a circular patio in the backyard. The diameter is 7 yards. What is the area of the patio?

11,304 sq ft

q. A Ferris wheel has a radius of 60', what is the area of the Ferris wheel?

4,096.44 sq ft

r. The spray from a spinning lawn sprinkler makes a circle with a 36' radius, what is the area of the circle?

4,654.265 sq cm

s. A circular platter that is 77 centimeters in diameter will be used for the party wings. What is the area of this platter?

471.2 sq ft

t. John wants to replace his floor boards in a circular shaped room. If the diameter of the room is 24 ½ inches, how many square feet of floor board will John need for this project? Round the the tenths place.

124.6 sq m

u. A circular sun dial has a radius of 6.3 centimeters. What is the area of the sun dial? Round to the tenths place.

19.63 sq cm

v. What is the area of a circle with a diameter of 5 cm? Round to the hundredths place.

113 sq cm

w. What is the area of a circle with a diameter of 12 cm? Round to the nearest whole number.

28.3 sq cm

x. What is the area of a circle with a diameter of 6 cm? Round to the tenths place.

78.5 sq cm

y. What is the area of a circle with a radius of 5 cm?

12.6 sq cm

z. What is the area of a circle with a radius of 2 cm? Round to the tenths place.