I'm going to assume you want to find the third side of a triangle. We can use the pythagorean theorem to solve; a^2 + b^2 = c^2
a = 5
b = 3
c = ?
Solve.
5^2 + 3^2 = c^2
25 + 9 = c^2
34 = c^2
√34 = √c^2
5.8 ≈ c
Best of Luck!
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