Circumference

Front

What is the formula for calculating the circumference of a circle?

Back

The circumference (C) of a circle can be calculated using the formula C = 2πr, where r is the radius of the circle.

Front

If the radius of a circle is 7 cm, what is its circumference?

Back

Using the formula C = 2πr, the circumference is C = 2π(7) ≈ 43.98 cm.

Front

What is the relationship between the diameter and the radius of a circle?

Back

The diameter (d) of a circle is twice the radius (r), so d = 2r.

Front

How do you convert the diameter of a circle to its circumference?

Back

You can convert the diameter to circumference using the formula C = πd, where d is the diameter.

Front

What is the circumference of a circle with a diameter of 10 meters?

Back

Using the formula C = πd, the circumference is C = π(10) ≈ 31.42 meters.

Front

What is the radius of a circle if its circumference is 31.4 cm?

Back

Using the formula C = 2πr, the radius can be found as r = C/(2π) = 31.4/(2π) ≈ 5 cm.

Front

What is the circumference of a circle with a radius of 5 inches?

Back

Using the formula C = 2πr, the circumference is C = 2π(5) ≈ 31.42 inches.

Front

What is the definition of circumference?

Back

Circumference is the distance around the edge of a circle.

Front

If a circle has a circumference of 62.83 cm, what is its radius?

Back

Using the formula C = 2πr, the radius is r = C/(2π) = 62.83/(2π) ≈ 10 cm.

Front

What is the circumference of a circle with a radius of 12 cm?

Back

Using the formula C = 2πr, the circumference is C = 2π(12) ≈ 75.40 cm.