It is the 13th digit after the decimal point.
3.14159265358979...
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3.141592
22/7=pi (roughly) 7 times pi is 21.99115 pi is 3.1415926535898 etc
7*pi/5 = 1.4*pi pi < 1.4*pi < 1.5*pi and so the angle is in the third quadrant.
A = (pi) * r^2 = (pi) * (7)^2 = 49*(pi)
It wasn't thought of. It's just "the answer". People thought of 22/7