The figure shows a circle and two identical quadrants.
Find the area and perimeter of the blue part.
Take pi to be 22 over 7.
Can you identify the shapes that made up the blue part?
The blue part is made up of a circle and two other parts which are identical.
We can find the area of the circle easily using the formula, but there is no formula for finding the area of each of the other two parts.
What should we do?