Circumference

Front

What is the circumference of a circle?

Back

The distance around the circle, calculated using the formula C = π·d or C = 2·π·r.

Front

What does 'r' represent in the formula C = 2·π·r?

Back

The radius of the circle.

Front

What is the relationship between diameter and radius?

Back

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

Front

How do you calculate the circumference if the radius is 7 cm?

Back

C = 2·π·7 cm ≈ 43.98 cm.

Front

What is the value of π (pi)?

Back

Approximately 3.14 or 22/7.

Front

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

Back

C = π·10 cm ≈ 31.4 cm.

Front

What is the diameter of a circle with a circumference of 62.8 cm?

Back

d = C/π = 62.8 cm/π ≈ 20 cm.

Front

What is the radius of a circle with a circumference of 31.4 cm?

Back

r = C/(2·π) = 31.4 cm/(2·π) ≈ 5 cm.

Front

What does 'C' represent in the formula C = π·d?

Back

The circumference of the circle.

Front

If a circle has a radius of 4 m, what is its diameter?

Back

d = 2·r = 2·4 m = 8 m.