Answer:
square root of 45.
Explanation:
One possible plot point to complete the triangle is (2, 2), which makes the distance from there to (8,2) = 6, and the distance from (2,2) to (2,5) = 3
So 3 squared + 6 squared = ? squared
9 + 36 = 45, so the hypotenuse's length is the square root of 45.