Radius and Diameter
Circumference
Area
Circles and Beyond
Shaded Area
100
What is the diameter of a circle if the radius is 7
diameter = 14
100
Find the approximate circumference:
When radius = 5
31.4
100
Find the approximate Area of a circle when
Radius = 4
Area = 50.24
100
The olympic symbol consists of 5 circles of different colors. Without looking it up, what are the 5 colors?
Blue
Black
Red
Yellow
Green
200
What is the radius of a circle if the diameter is 19
Radius = 9.5
200
Find the approximate Circumference
when diameter = 21.2
circumference = 66.568
200
Find the approximate Area of a circle
when diameter = 14
area = 153.86
200
Determine which pizza has a better price per square inch.
The 12-inch diameter pizza for $8.99 or the 8-inch diameter pizza for $5.
The 12 inch diameter pizza for $8.99
(The 12 inch is about $0.08 per square inch)
(The 8-inch is about $0.10 per square inch)
200
About 166.67 square cm
300
What is the diameter of a circle if the radius is 19.4
diameter = 38.8
300
Find the approximate radius when the circumference is about 100.48
Radius = 16
300
Find the approximate Area of a circle when the diameter = 16.8
Area = 221.5584 or 221.56
300
Which pizza provided a better cost per square inch?
The large 16-inch diameter pizza for $12.99 or the $26 X-Large with a radius of 12 in.
The $26 X-Large pizza is a better deal.
(The large pizza is about $0.064 per square inch)
(The X-Large pizza is about $0.058 per square inch)
300
The inner circle has a radius of 9 in. The outer circle has a diameter of 24 in. Determine the approximate area of the shaded region.
About 197.82 square inches.
400
What is the radius of a circle if the diameter is 16.5
Radius = 8.25
400
Find the approximate Radius when the Circumference is about 120.576
Radius = 19.2
400
Find the approximate Area of a circle when the circumference is about 56.52
Area = 254.34 (radius is 9)
400
A circular silver tray has a diameter of 28 centimeters.
If the tray cost $136, what is the cost per square centimeter (round to the nearest cent).
About $0.22 for 1 square centimeter.
400
About 45.5928 or 45.59 square cm
500
Find the approximate diameter when the Circumference is 214.776
Diameter = 68.4
500
Find the approximate Area of a circle when the circumference is about 41.448
Area = 136.7784 or 136.78 (radius is 6.6)
500
Determine the distance the runners run around the edge of the track. Round to the nearest whole number
1,320 feet
(Outer rectangle is 1000 ft, and 2 semi circles that are about 160.14 ft each or 320.28 ft total)
500
Area of the shaded region is about 5.5728 or 5.57 cm
(Area of the rectangle is 25.92 square cm)
(Area of semi-circle is about 20.3472 square cm)