Question

Anyone know the answer?

Answer 1

They will need √161 feet, or about 12.69 feet of fencing. √161 is irrational because 161 is not a perfect square.

Explanation:

`{8}^(2) + {x}^(2) = {15}^(2)`

`64 + {x}^(2) = 225`

`{x}^(2) = 161`

`x = √(161) = 12.69`