What is the origins of pi and how did it originally get found and created

The area of a rectangle is 15+5y square feet. which of the following expressions could be the length of the sides of the rectangle, in feet a. 5 and 3y b. 5 and 3+y c. 5 and 5+y d. 3 and 5+3y

Consider circle o, where and . m∠bpd °. °.

Will give a: 122 b: 90 c: 48 d: 180