Calculating Circumference

Front

What is the formula to calculate the circumference of a circle?

Back

C = πD, where C is the circumference and D is the diameter.

Front

What is the value of π (pi) used in calculations?

Back

π is approximately 3.14.

Front

How do you find the diameter of a circle if you know the radius?

Back

D = 2r, where D is the diameter and r is the radius.

Front

What is the circumference of a circle with a radius of 18 ft?

Back

113.04 ft.

Front

What is the circumference of a circle with a diameter of 12 ft?

Back

37.7 ft.

Front

What is the circumference of a circle with a diameter of 500 km?

Back

1570 km.

Front

If the radius of a circle is 17 mm, what is the diameter?

Back

34 mm.

Front

What is the relationship between diameter and circumference?

Back

The circumference is directly proportional to the diameter (C = πD).

Front

How do you convert radius to diameter?

Back

Multiply the radius by 2.

Front

What is the circumference of a circle with a diameter of 8 cm?

Back

25.12 cm.