Circumference

Front

What is the circumference of a circle?

Back

The circumference of a circle is the distance around it, calculated using the formula C = 2πr, where r is the radius.

Front

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

Back

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

Front

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

Back

C = 2π(5) = 10π cm, approximately 31.42 cm.

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the radius: d = 2r.

Front

How do you find the radius if you know the circumference?

Back

You can find the radius using the formula r = C/(2π).

Front

What is π (pi)?

Back

π (pi) is a mathematical constant approximately equal to 3.14, representing the ratio of the circumference of a circle to its diameter.

Front

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

Back

C = πd = π(10) = 10π cm, approximately 31.42 cm.

Front

What is the circumference of a circle with a radius of 7 m?

Back

C = 2π(7) = 14π m, approximately 43.98 m.

Front

What is the unit of measurement for circumference?

Back

The unit of measurement for circumference is the same as the unit used for the radius or diameter, such as centimeters (cm) or meters (m).

Front

How does increasing the radius affect the circumference?

Back

Increasing the radius increases the circumference; they are directly proportional.