Respuesta :

Annder

Step-by-step explanation:

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.

Answer:

84

Step-by-step explanation:

According to Pythagoras theorem

x²+y²=z²

x=√z²-y²

x=√85²-13²

x=√7225-169

x=√7056

x=84

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