Circumference Practice

Front

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

Back

Circumference = π × diameter (C = πd) or Circumference = 2 × π × radius (C = 2πr)

Front

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

Back

5 cm

Front

What is the value of π (pi) commonly approximated as?

Back

3.14

Front

How do you find the circumference of a circle with a radius of 7 inches?

Back

Circumference = 2 × π × 7 = 43.96 inches (using π = 3.14)

Front

What is the diameter of a circle if the radius is 12 cm?

Back

24 cm

Front

Calculate the circumference of a circle with a diameter of 8 feet (use π = 3.14).

Back

Circumference = π × 8 = 25.12 feet

Front

What is the relationship between diameter and radius?

Back

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

Front

If a circular garden has a circumference of 31.4 meters, what is its diameter?

Back

10 meters (using C = πd, d = C/π).

Front

What is the circumference of a circle with a radius of 3 cm?

Back

Circumference = 2 × π × 3 = 18.84 cm (using π = 3.14).

Front

If the circumference of a circle is 62.8 cm, what is the diameter?

Back

20 cm (using C = πd, d = C/π).