Radius & Diameter
Circumference and Area
Arcs and Sectors
Circles in the real world
Composite figures
100
The diameter is 10 inches. Find the radius.
5 inches.
100
A circle has a diameter of 12.5 inches. What is the exact circumference?
12.5pi inches
100
A circle has an area of 12 ft2. It is cut into 4 equal pieces. What is the approximate area of each sector?
3 ft2
100
A bicycle wheel has a radius of 1 foot. If the bicycle wheel rotates one time, what is the exact distance traveled?
2pi ft
100
Find the approximate perimeter of this shape.
10.28 in
200
The diameter is 25 feet. Find the radius.
12.5 feet.
200
A circle has a diameter of 25 inches. What is the approximate circumference? (round to 2 decimals)
78.54 in
200
A circle has a circumference of 22 feet. It is cut into 10 equal pieces. What is the approximate length of each of the ten arcs?
2.2 ft.
200
A large Jeep has a tire with a radius of 18 inches. Find the approximate circumference of the wheel.
113.04 inches
200
Find the exact area.
45.1pi i n^2
300
The circumference of the circle is 56.52 or 18pi.
Find the radius.
9 inches
300
A circle has a radius of 50 miles. What is the area of the circle TO THE NEAREST MILE?
(use 3.14 for pi)
7,850 mi2
300
A pizza has a diameter of 16 inches. The pizza is cut into 8 pieces. What is the exact length of crust (circumference) on each piece?
2pi
300
Matthew is learning to drive a car. The steering wheel in his car has a radius of 9 inches. His instructor says "Place your hands at 10 and 2." (1/3 of the circle) What is the exact area of the sector formed?
27pi i n^2
300
Find the approximate area of the shaded region.
13.76 ft2
400
The area of this circle is
25pi i n^2.
Find the radius.
5 inches.
400
A circle has a diameter of 16 units. Find the exact area.
64pi
400
A pizza has a diameter of 16 inches. It is cut into 4 pieces. Jane eats 3 of the pieces. What is the exact area of pizza she is eating?
48pi
400
John owns a circular pool in his backyard. If he swims around the pool, he swims 30pi meters. What is the radius of this circle?
15 meters.
400
Find the exact area of the shaded region.
400-64pi
500
A circle has an area of
256pi cm^2.
Find the diameter.
32cm
500
A circle has a circumference of
6pi
What is the exact area?9pi
500
What is the exact area of the shaded region?
12pi
500
A pizza with a diameter of 22 inches cost $28. How much does one square inch of pizza cost?
$0.074 per square inch
500
find the approximate area of the shape. 
636 cm2