Area of a 14 inch diameter?

I assume this is a circular measurement. The area of a circle is determined by pi x r squared. If the diameter is 14 inches, the radius is half of that (7 inches). A = pi x r 2 A = 3.14 x 7 2 A = 3.14 x 49 A = 153.86 inches 2. (Area is always in squared units.) If your math level has covered significant digits, re-read the question for significant digits. Two significant digits (as could be determined by the way you worded your question - "14") would give a different answer. Scientific notation would be necessary in your answer. 153.86 inches would have to been written as: A = 1.5 x 10 2 inches2