Circumference

Front

What is the formula for calculating the circumference of a circle?

Back

C = π·d or C = 2·π·r, where C is the circumference, d is the diameter, and r is the radius.

Front

If the diameter of a circle is 10 inches, what is the radius?

Back

5 inches (Radius is half of the diameter).

Front

What does the symbol π (pi) represent in geometry?

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

How do you convert diameter to radius?

Back

To convert diameter to radius, divide the diameter by 2.

Front

What is the circumference of a circle with a radius of 7 cm? Use 3.14 for pi.

Back

43.96 cm (C = 2·π·r = 2·3.14·7).

Front

What is the relationship between diameter and circumference?

Back

The circumference is directly proportional to the diameter; as the diameter increases, the circumference increases.

Front

If a circle has a circumference of 31.4 cm, what is its diameter? Use 3.14 for pi.

Back

10 cm (d = C/π = 31.4/3.14).

Front

What is the diameter of a circle if the radius is 12 inches?

Back

24 inches (Diameter is twice the radius).

Front

What is the circumference of a circle with a diameter of 16 inches? Use 3.14 for pi.

Back

50.24 inches (C = π·d = 3.14·16).

Front

What does the term 'radius' refer to in a circle?

Back

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