Answer:
84
Explanation:
According to Pythagoras theorem
x²+y²=z²
x=√z²-y²
x=√85²-13²
x=√7225-169
x=√7056
x=84
if the length of the third side = a
a² + 13² = 85²
a² + 169 = 7,225
a² = 7,225 - 169
a² = 7,056
a = square root 7,056
a = 84
So, the length of the third side is equal 84 unit.
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