How many square inches are in a 16 inch diameter circle?

Answer 1

To do this, you first find the radius of the circle. To do this, you divide 16 by pi, which gives 5.09 (to two decimal places). Half of this gives you the radius - around 2.55. You then square the radius, in this case giving approximately 6.48, and multiply it by two, which yields the answer of roughly 12.97. There's your answer - 12.97 inches squared (to two decimal places).

N.B. These averages may seem slightly off, but I did the calculations on a calculator, simplifying each step.