Question

A square ABCD of side 9 cm, has a triangle EAF cut- out of it. find the area of the remaining portion.

Answer 1

area = s2

For example, suppose the side of your square is 10 cm. Multiply 10 cm x 10 cm to get 100 square centimeters.

Calculate the circle's radius, which is half the diameter:

radius = 1/2 diameter

Because the circle fits entirely inside the square, the diameter is 10 cm. The radius is half the diameter, which is 5 cm.

Calculate the area of the circle using the equation:
area = πr2

The value of pi (π) is 3.14, so the equation becomes 3.14 x 5 cm2. So you have 3.14 x 25 cm squared, equaling 78.5 square centimeters.

Subtract the area of the circle (78.5 cm squared) from the area of the square (100 cm squared) to determine the area outside the circle, but still within the square. This becomes 100 cm2 - 78.5 cm2, equaling 21.5 cm squared.