Using the formula C = 2πr, find the circumference of a circle with diameter of 28 inches.

A. 56 in.

B. 44 in.

C. 28 in.

D. 88 in

Ok so the given is the length of the diameter.

diameter=28 in

so the radius is half the diameter

radius=28/2=14 in

Circumference formula=2 * pi * radius

C=2 (pi) (14) - pi can be considered as 3.14 or the value in the calculator

C=28 (PI)

C=87.96 in ≈ 88 in

The easiest way is just use the diameter times the pi

Because 2 times the radius is just the diameter

So we can derive that

C = diameter * pi

C=d (pi)

C=28 (pi)

C=87.96 in ≈ 88 in

Diameter = 28 inches

radius, r = Diameter/2 = 28/2 = 14 inches.

C = 2πr

C = 2*π*14

C = 28π

C ≈ 28*3.142

C ≈ 87.976

C ≈ 88 inches

Option D.