Answer: 88 inches

Step-by-step explanation:

We know that the formula to find the circumference of circle is given by :-

C=2pi r, where r is the radius of the circle.

Given : Diameter of circle = 28 inches

Also, diameter is twice of radius.

i.e. 2r=28

Therefore, the circumference of circle will be :-

C=2pi r=(2r)pi=28times(3.14)=87.92text{ inches}approx88text{ inches}

Hence, the  circumference of circle is 88 inches.