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.

Tags

CCSS.7.G.B.4

Front

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

Back

5 inches (Radius is half of the diameter).

Tags

CCSS.7.G.B.4

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.

Tags

CCSS.HSG.GMD.A.1

Front

How do you convert diameter to radius?

Back

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

Tags

CCSS.7.G.B.4

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).

Tags

CCSS.7.G.B.4

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.

Tags

CCSS.7.G.B.4

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).

Tags

CCSS.7.G.B.4

Front

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

Back

24 inches (Diameter is twice the radius).

Tags

CCSS.7.G.B.4

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).

Tags

CCSS.7.G.B.4

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.