Question

Using the formula C=2TTr, find the circumference of a circle with a diameter of 28 in. round your answer to the nearest inch

Answer 1

Radius = diameter /2 

so radius = 28/2 = 14 

Circumference = 2 x pi x 14 = 28 pi 

or from calculator = 87.96 inches ....correct to 2 decimal places

Answer 2

radius = diameter/2

so 28/2=14

 using 3.14 for PI

2*3.14*14 = 87.92 = 88 inches