Vocabulary
Circumference
Area
Given Circumference...
Given Area...
100
The distance from the center of a circle to the outside of the circle.
radius
200
The distance across the circle through the center
diameter
200
Find the circumference of the circle. Round your answer to the nearest hundredths place.
C = π d
C = π (10)
C = 31.42 cm
200
Calculate the area of the circle. Leave your answer in terms of π .
A = π r2
A = π (5)2
A = 25π cm2
300
What is circumference of a circle?
Distance around the outside of a circle.
300
Find the circumference of the circle. Round your answer to the nearest hundredths place.
C = π d
C = π (30)
C = 94.25 cm
300
Calculate the area of the circle. Round your answer to the nearest hundredth.
A = π r2
A = π (14)2
A = 615.75 cm2
400
Find the diameter, radius, and area given that the circumference is 75.36 miles. Use 3.14 for π , round your answer to the nearest hundredths place.
C = π d
75.36 = (3.14)d
24 miles = d
12 miles = r
A = π r2
A = (3.14)(12)2
A = 452.16 miles2
400
Find the radius, diameter, and circumference given that the area is 254.34 km. Use 3.14 for π , round your answer to the nearest hundredths place.
A = π r2
254.34 = (3.14)r2 <-- Divide by 3.14
81 = r2 <-- Square Root
9 km = r
18 km = d
C = π d
C = (3.14)(18)
C = 56.52 km
1400
A circular park has a diameter of 5/3 mile and needs to be fenced around. How many miles of fencing is needed? Round your answer to the nearest tenth.
C = π d
C = π (5/3)
C = 5.2 miles