Circumference of Circles

Front

What is the formula for the circumference of a circle given the diameter?

Back

C = π × D, where C is the circumference and D is the diameter.

Front

How do you calculate the circumference of a circle if you know the radius?

Back

C = 2π × r, where C is the circumference and r is the radius.

Front

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

Back

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

Front

If a circle has a diameter of 10 meters, what is its circumference?

Back

C = 10π or about 31.42 m.

Front

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

Back

C = 10π or about 31.42 in.

Front

What does the term 'circumference' refer to in relation to a circle?

Back

Circumference refers to the distance around the circle.

Front

If a circular garden has a radius of 3 meters, what is the length of the fence needed to go around it?

Back

C = 6π or about 18.85 m.

Front

What is the approximate value of π?

Back

π is approximately 3.14.

Front

How would you express the circumference of a circle in terms of diameter?

Back

C = πD.

Front

What is the circumference of a circle with a diameter of 12 feet?

Back

C = 12π or about 37.70 ft.