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

C = pi * d

C = 3.14 * 28

C = 87.92 inches

To find the circumference of a circle using the formula C = 2πr, you need to know the value of the radius (r). Given that the diameter (d) is 28 inches, you can calculate the radius by dividing the diameter by 2.

r = d/2 = 28/2 = 14 inches

Now that you have the value of the radius, you can substitute it in the formula to find the circumference (C):

C = 2πr = 2π(14) = 28π inches

Therefore, the circumference of a circle with a diameter of 28 inches is 28π inches.