Circumference, Radius, and Diameter

Front

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

Back

C = π·d, where C is the circumference and d is the diameter.

Front

If the diameter of a circle is 70 m, what is the radius?

Back

The radius is 35 m.

Front

What is the relationship between diameter and radius?

Back

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

Front

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

Back

C represents the circumference of the circle.

Front

How do you calculate the diameter if you know the circumference?

Back

Use the formula d = C/π.

Front

What is the radius of a circle with a circumference of 62.83 ft?

Back

The radius is 10 ft.

Front

What is the diameter of a circle with a radius of 4 mm?

Back

The diameter is 8 mm.

Front

If a circular swimming pool has a circumference of 65.94 ft, what is its diameter?

Back

The diameter is 21 ft.

Front

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

Back

The circumference is 31.42 cm.

Front

What is the formula to calculate the radius from the circumference?

Back

r = C/(2π).