Circumference of a Circle
Area of Circles
Area and Circumference of a Circle
Miscellaneous
Vocabulary
100
What is the equation (s) for the circumference of a circle?
C=2πr or C=πd
100
What is the equation for the area of a circle?
A=πr2
100
What is the circumference of a circle with a diameter of 1 foot?
3.14 ft
100
Xavier needs to bike a minimum of 80 miles this week for his training. If he has already biked 14 miles this week, then how many miles should he bike on each of the 6 remaining days this week?
x ≥ 11
100
What do we call the two-dimensional figure that is 360 degrees with no straight lines?
A Circle
200
Find the Circumference of a Circle with a diameter of 2 yards. Use 3.14 for pi and Round to the tenth place.
6.28 yds
200
Find the area of a circle with a radius of 5 cm. Use 3.14 for pi.
A = πr2
78.5 cm2
200
What is the area of a circle with a radius of 1 foot?
Hint (Remember Area = πr2
3.14 ft2
200
Solve.
x ≥ 36
200
What is the term that describes the perimeter of a circle?
Circumference
300
Find the Circumference of a Circle with a diameter of 5 yards. Use 3.14 for pi and Round to the tenth place
15.7 yds
300
Find the area of a circle with a radius of 3 km. Use 3.14 for pi.
28.26 km2
300
What is the circumference of a circle with a diameter of 4 meters?
12.56 m
300
A fifteen passenger van is rented for a family vacation. The van rental is $75.00 per day, plus a $160.00 insurance fee. What inequality could be used to find x, the number of days the van can be rented if they want to spend less than $760.00 on the van rental?
75.00x + 160.00 < 760.00
300
What is the term used to describe a line that runs from the center of a circle to any point on the edge of the circle?
Radius
400
Find the Circumference of a Circle where the radius = 9.5 inches. Round to 1 decimal place.
59.7 in
400
Find the area of a circle with the diameter of 12 km. (Remember A = πr2 )
113 km2
400
What is the area of a circle with a radius of 2 meters?
12.56 m2
400
Solve the proportion.
20/x = 5.2/6.5
25
400
What is the term that describes the line that extends from one side of a circle to the opposite side, passing through the center?
Diameter
500
Find the radius of a circle with a circumference of 942 meters.
150 meters
500
Find the area of a circle with a diameter of 78.4 ft.
39.2 ✖ 39.2 ✖ 3.14
=4825 ft2
500
What is the circumference of a circle with a diameter of 8 miles?
25.12 mi
500
Find the radius of the circle given the circumference of 62.8 mi. Remember: C = πd
10 mi
500
What is the ratio of a circle's circumference to its diameter called?
Pi, π, 3.14, 22/7