Finding Circumference

Front

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

Back

The circumference (C) of a circle can be calculated using the formula C = 2πr, where r is the radius of the circle.

Tags

CCSS.7.G.B.4

Front

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

Back

Using the formula C = 2πr, the circumference is C = 2π(5) = 31.42 cm.

Tags

CCSS.7.G.B.4

Front

What is the value of π (pi) approximately?

Back

π (pi) is approximately 3.14.

Tags

CCSS.HSG.GMD.A.1

Front

How does the circumference change if the radius of a circle is doubled?

Back

If the radius is doubled, the circumference also doubles, since C = 2πr.

Tags

CCSS.7.G.B.4

Front

What is the circumference of a circle with a diameter of 10 m?

Back

Using the formula C = πd, where d is the diameter, the circumference is C = π(10) ≈ 31.42 m.

Tags

CCSS.7.G.B.4

Front

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

Back

The diameter (d) of a circle is twice the radius (r), so d = 2r.

Tags

CCSS.7.G.B.4

Front

If the circumference of a circle is 62.83 m, what is its radius?

Back

Using the formula C = 2πr, the radius can be found as r = C/(2π) = 62.83/(2π) ≈ 10 m.

Tags

CCSS.7.G.B.4

Front

What units are used to measure circumference?

Back

Circumference is measured in linear units, such as meters (m), centimeters (cm), inches (in), or yards (yd).

Tags

CCSS.2.MD.A.2

Front

How do you convert the circumference from meters to centimeters?

Back

To convert from meters to centimeters, multiply the circumference in meters by 100 (1 m = 100 cm).

Tags

CCSS.2.MD.A.2

Front

What is the circumference of a circle with a radius of 3.5 ft?

Back

Using the formula C = 2πr, the circumference is C = 2π(3.5) ≈ 21.99 ft.

Tags

CCSS.7.G.B.4