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The square root of A2 is... A !
If it's a right triangle, a2 + b2 = c2 3 + 5 = c2 c = the square root of 8.
If the triangle is a right triangle use Pythagorus' Theorum: A2 + B2 = C2 and the height would be the square root of (A2 + B2).
13. The figures provided (including the answer) satisfy Pythagoras' Theorem. a2 = b2 + c2 a2 = 52 + 122 = 25 + 144 = 169 Then a = √169 = 13
a2 + b2 = c2 a2 = c2 - b2 a = sqrt(c2 - b2) ==================no +/- square root as a negative length makes no sense in a right triangle