We are told that a window has the shape of a semicircle with a diameter of 28 inches.
We want to find the area of the window. Recall that the area A of a semicircle equals half the product of π and the square of its radius r.
A = 1/2 π r^2
Since the diameter of the window is 28 inches, the radius of the window is ( 12* 28) inches or 14 inches. Let's calculate the area using this information. We can use 3.14 as an estimation of π.
