Radius & Diameter
Circumference and Area
Circles in the real world
100
The diameter is 10 inches. Find the radius.
What is 5 inches.
100
A circle has a diameter of 12.5 inches. What is the circumference in terms of
pi
?
What is 12.5pi inches?
100
A bicycle wheel has a radius of 1 foot. If the bicycle wheel rotates one time, what distance is travelled?
What is 2pi or 6.28 feet.
200
The diameter is 25 feet. Find the radius.
What is 12.5 feet.
200
A circle has a diameter of 25 inches. What is the circumference rounded correctly to 2 decimals?
What is 78.54 inches
200
A large Jeep has a tire with a radius of 18 inches. Find the circumference of the wheel.
What is 36pi?
300
The circumference of the circle is
18pi inches.
Find the radius.
What is 9 inches.
300
A circle has a radius of 50 miles. What is the area of the circle TO THE NEAREST MILE?
What is 7854 mi2.
300
John owns a circular pool in his back yard. If he swims around the pool, he swims 30pi meters. What is the radius of this circle?
What is 15 meters.
400
The area of this circle is
25pi in2.
Find the radius.
What is 5 inches.
400
A circle has a diameter of 16. Find the area in terms of pi.
What is 64 pi
400
A circle has a diameter of 28 inches. What is the area of a quarter of the circle? Give the approximate answer.
What is 154? (153.94)
500
A circle has an area of
256pi cm2.
Find the diameter.
What is 32cm
500
A circle has a circumference of
6pi
.
What is the area?
What is 9pi?
500
What is the area of the shaded region in terms of pi?
What is
12pi