Definition/Formulas
Diameter
What is a straight segment from one side of a circle to the other that goes through the center
Radius of 5 cm
What is 10 cm
Diameter of 22 cm
What is a radius of 11 cm?
Radius of 2
12.56
Radius is 3 cm
28.26 cm2
Radius
Radius of 12 cm
What is 24 cm
Diameter of 48 cm
What is a radius of 24 cm?
Diameter of 4
12.56
Diameter of 10 in
78.5 in2
Pi
What is 3.14
Circumference of 31.4
What is 10
Circumference of 18.84 cm
What is a radius of 3 cm
Diameter of 7
21.98
Radius of 7 m
153.86 m2
Circumference
What is the perimeter of a circle
Circumference of 65.94 cm
What is 21 cm
Circumference of 43.96 cm
Circumference of a circle with a radius of 7 cm?
Radius of 5
31.4
A groundskeeper needs grass seed to cover a circular field, 200 feet in diameter.
A store sells 40-pound bags of grass seed. One pound of grass seed covers about 400 square feet of field.
What is the smallest number of bags the groundskeeper must buy to cover the circular field?
2 bags
Area of a Circle
What is 3.14 x r2
Area of 78.5 cm2
What is diameter of 10 cm
Area of 12.56 cm2
What is the area of a circle with a radius of 2 cm?
Diameter of 1000
3140
If the minute hand of a clock is 9 inches long and starts at the center and ends at the edge of a clock
What is the area of the clocks face?
254.34 in2