# Using the formula C = 2r, find the circumference of a circle with diameter of 28 inches. [Solved] Thanx 4 the help

There are two ways to find the circumference of a circle. One way is 2r, where r is the radius, or d, where d is the diameter. Both ways are the same because a radius is equal to a diameter. Using 2r,
we first divide 48 by 2, which is 24, the radius. The formula is now C = 2(24) Multiply 24 and 2 and you get 48. 48 * is 48.

as radius is half of diameter, r = d/2 where d is diameter of the circle
now in the formula C = 2r we can put d/2 at the place of r because r=d/2
now formula becomes C = 2(d/2) = 2 * 22/7 * 28 = 132 inches

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

so radius = 28/2 = 14

diameter = 2 times radius
d = 2r
2r = 28 inches
r = 28/2 inches
r = 14 inches.

87.964594300514210676954014731826 inches

87.964594300514210676954014731826 inches

i have explained in the easiest way i can..

48

radius = diameter /2

48

r = d/2
C = 2r = 2d/2 228/2 = 28 inches

r = d/2
C = 2r = 2d/2 228/2 = 28 inches