circumference of a circle

Front

What is the circumference of a circle?

Back

The distance around the circle, calculated as C = πd or C = 2πr.

Front

What is the formula for the circumference of a circle?

Back

C = πd or C = 2πr, where d is the diameter and r is the radius.

Front

What is the diameter of a circle?

Back

The distance across the circle through its center, equal to twice the radius (d = 2r).

Front

What is the radius of a circle?

Back

The distance from the center of the circle to any point on its circumference.

Front

If the radius of a circle is 5 cm, what is the diameter?

Back

10 cm (since diameter d = 2r).

Front

If the diameter of a circle is 16 cm, what is the radius?

Back

8 cm (since radius r = d/2).

Front

What is the circumference of a circle with a radius of 5 in terms of π?

Back

10π square units.

Front

How do you convert radius to diameter?

Back

Multiply the radius by 2.

Front

How do you convert diameter to radius?

Back

Divide the diameter by 2.

Front

What is the relationship between circumference and diameter?

Back

The circumference is always π times the diameter.