Circumference

Front

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

Back

The circumference (C) of a circle can be found using the formula: C = 2πr or C = πd, where r is the radius and d is the diameter.

Front

If the diameter of a circle is 19 inches, what is the radius?

Back

The radius is half of the diameter. Therefore, if the diameter is 19 inches, the radius is 9.5 inches.

Front

What is the circumference of a circle with a radius of 12.5 mm?

Back

The circumference is calculated as C = 2πr. For a radius of 12.5 mm, C = 2π(12.5) ≈ 78.5 mm.

Front

What does the term 'circumference' refer to?

Back

Circumference is the measurement around the circle.

Front

If the circumference of a circle is 88 inches, what is the diameter?

Back

The diameter can be found using the formula C = πd. Rearranging gives d = C/π. Therefore, d = 88/π ≈ 28 inches.

Front

What is the relationship between diameter and radius?

Back

The radius is half of the diameter. Therefore, r = d/2.

Front

If a circle has a circumference of 44 inches, what is its radius?

Back

Using the formula C = 2πr, we can rearrange to find r = C/(2π). Thus, r = 44/(2π) ≈ 7 inches.

Front

What is the circumference of a circle with a diameter of 36 cm?

Back

Using the formula C = πd, the circumference is C = π(36) ≈ 113.1 cm.

Front

If the radius of a circle is 6 cm, what is the circumference?

Back

Using the formula C = 2πr, the circumference is C = 2π(6) ≈ 37.7 cm.

Front

What is the diameter of a circle if its circumference is 116 inches?

Back

Using the formula C = πd, we can rearrange to find d = C/π. Thus, d = 116/π ≈ 36.9 inches.