Heron's Formula

One guy wrote a formula for finding the area of a triangle that can be applied if you know the length of the sides, and knowing the semi-perimeter (half the value of the perimeter).
The formula is : √s(s - a)(s - b)(s - c)

guy : help me I don't know the height of the triangle to find the area.
smart guy : use the heron's formula
guy : imma search it up
guy : thx i got answer as 42cm^2

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