What is the area of a circle if the diameter is 1 ft and 6 in?

The area of a circle is:

pi times radius squared

So, the area of a circle with a diameter of 1ft 6 in would be

(diameter = radius times 2)

3.14 (pi) times 1ft 6 in = area

3.14 times (1 ft 6 in = 18in) = area

3.14 times ((18/2) ²) = area

Area = 254.34