Circumference of Circles

Front

What is the circumference of a circle?

Back

The distance around a circle.

Front

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

Back

C = 2πr or C = πd, where r is the radius and d is the diameter.

Front

If the radius of a circle is 10 cm, what is its circumference?

Back

62.8 cm (C = 2πr = 2 * 3.14 * 10).

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the radius (d = 2r).

Front

If the diameter of a circle is 20 inches, what is the radius?

Back

10 inches (r = d/2).

Front

What is the circumference of a circle with a radius of 33 ft?

Back

207.2 ft (C = 2πr = 2 * 3.14 * 33).

Front

What is the circumference of a circle with a diameter of 24 cm?

Back

75.36 cm (C = πd = 3.14 * 24).

Front

If a circle has a circumference of 31.4 cm, what is its radius?

Back

5 cm (C = 2πr, r = C/(2π)).

Front

What is π (pi)?

Back

A mathematical constant approximately equal to 3.14, representing the ratio of a circle's circumference to its diameter.

Front

How do you convert diameter to circumference?

Back

Use the formula C = πd.