Answer:
Explanation:
Use your 45-45-90 special triangle with side lengths 1, 1, sqrt(2).
The given triangle has legs length 8 (given) which is 8 times the size of our special 1-1-sqrt(2) triangle.
Therefore the length of the hypotenuse is 8 times the length of the hypotenuse in our special triangle
= 8 sqrt(2)