Circumference, Arc Measure, and Arc Length

Front

What is the formula for the circumference of a circle?

Back

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

Front

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

Back

5 cm

Front

What is the relationship between diameter and radius?

Back

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

Front

How do you calculate the circumference of a circle with a known radius?

Back

Use the formula C = 2πr.

Front

What is the value of π (pi) approximately?

Back

π is approximately 3.14.

Front

If a circle has a circumference of 31.4 cm, what is its radius?

Back

5 cm.

Front

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

Back

43.98 cm.

Front

Calculate the circumference of a circle with a radius of 8 inches.

Back

50.27 inches.

Front

If the diameter of a circle is 40 ft, what is the radius?

Back

20 ft.

Front

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

Back

31.4 inches.