Circumference Practice

Front

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

Back

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

Front

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

Back

C = 2π(5) = 10π ft (approximately 31.4 ft).

Front

What is the relationship between diameter and radius?

Back

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

Front

If the diameter of a circle is 12ft, what is the radius?

Back

r = d/2 = 12/2 = 6ft.

Front

What is the value of π (pi) approximately?

Back

π is approximately 3.14.

Front

How do you convert circumference to diameter?

Back

To find the diameter from the circumference, use the formula: d = C/π.

Front

What is the circumference of a circle with a diameter of 8ft?

Back

C = πd = π(8) = 8π ft (approximately 25.12 ft).

Front

What does a whole fraction equal?

Back

Front

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

Back

r = C/(2π) = 31.4/(2π) = 5ft.

Front

What is the formula for finding the area of a circle?

Back

The area (A) of a circle is calculated using the formula: A = πr².