If you know the diameter of a circle, which statement describes how to find the area?
a) multiply the diameter by π.
b) square the diameter and multiply by π.
c) divide the diameter in half and multiply by π.
d) divide the diameter in half, square, and multiply by π.

Each of the walls of a room with square dimensions has been built with two pieces of sheetrock, a smaller one and a larger one. the length of all the smaller ones is the same and is stored in the variable small. similarly, the length of all the larger ones is the same and is stored in the variable large. write a single expression whose value is the total area of this room. do not use any method invocations.

If the scale factor between two circles is 2x/5y what is the ratio of their areas?

Adecorative window is made up of a rectangle with semicircles at either end. the ratio of ad to ab is 3: 2 and ab is 30 inches. what is the ratio of the area of the rectangle to the combined area of the semicircles? possible answers: a. 2: 3 b. 3: 2 c. 6: π d. 9: π e. 30: π