Question

a rectangle with one side of length 4 cm is inscribed in a circle of diameter 5 cm. find the area of the rectangle

Answer 1

Let the area be x.

Then it will be x^2 + 4^2 = 5^2

                        x^2 + 16 = 25

                       x^2 = 9

                        x = 3.

Area of the rectangle will be 3 * 4 = 12 cm^2.