In heron's formula, if (s-a)=5 (s-b)=7 (s-c)=8 then find s
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s-a = 5
s-b = 7
s-c = 8
add all of them: 3 s - (a+b+c) = 3s - 2s = s = 20
s-b = 7
s-c = 8
add all of them: 3 s - (a+b+c) = 3s - 2s = s = 20
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