Formulas
Circumference
Diameter
Area
Mystery
100
This is half the length of the diameter.
What is the radius?
100
The approximate circumference for a circle that has a diameter of 12 cm.
What is 36 cm
100
The approximate diameter of a circle with the circumference 60 cm
What is 20 cm
100
The area of a circle with the radius of 10 ft.
What is 314 square feet.
100

The two formulas for finding circumference of a circle.

What are C= d x pi and C= 2r x pi.

200
The formula for finding circumference in terms of diameter.
What is C = d x pi
200
The circumference for a circle that has a diameter of 12 cm.
What is 37.68
200
The approximate diameter of a wheel with the circumference of 15 feet.
What is 5 feet.
200
The area of a circle with the diameter of 16 feet.
What is 200.96 square feet.
200
The circumference of a circle with the diameter 8.3 cm (rounded to the nearest cm).
What is 26 cm.
300
Circumference divided by diameter.
What is the formula for Pi?
300
These are the common values for pi.
What are 3.14, 22/7, 3 and 1/7
300
The diameter of a circle with the circumference of 60 cm? (round to nearest hundredth)
What is 19.11 cm
300

The area of a circle with the radius of 6 cm.

What is 113.04 cm.

300
The name of the distance from the center of the circle to the edge of the circle.
What is the radius.
400
The formula for finding circumference in terms of radius.
What is C = 2r x pi
400
The circumference is about this length of the diameter.
What is 3 times the length.
400
The circumference of a circle with the diameter of 20 cm.
What is 62.8 cm
400
The formula for finding area of a circle.
What is A = r x r x pi
400
The number of radius squares that fit into the area of a circle.
What is pi or 3.14 radius squares
500
This is the formula for finding area of a circle.
What is A = r x r x pi
500
The perimeter around a basketball key made of a rectangle of 12 ft by 15 ft and a half circle with the diameter of 12 ft.
What is 60.84 ft.
500
The diameter is about this length of the circumference.
What is 1/3 the length
500
The total area of a basketball key made of a rectangle with the dimensions 15 ft by 12 ft and a half circle with the diameter 12 ft.
What is 180 + 56.52 = 236.52 square feet.
500
The length of the radius of a circle when the circumference is 31.4 miles.
What is 5 miles.
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