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s x s or s + s + s + s
2s (Two times "s")
there is no s in PI
Heron, or sometimes called as Hero, invented the formula. The formula was used to find the area of a scalene triangle or an SSS triangle. The formula states for a triangle with sides a, b and c, the area can be calculated like this,K=sqrt(s(s-a)(s-b)(s-c)), where K is the area and s is the semiperimeter of a triangle i.e. s=(a+b+c)/2.
Given the surface area, where S=surface area, the formula for finding the volume isV = √(S / 4pi)