Answer:
82 units.
Explanation:
The Pythagorean Theorem is a^2 + b^2 = c^2, where c is the hypotenuse and a and b are the legs.
In this case, 18 and 80 are the legs.
18^2 + 80^2 = c^2
324 + 6,400 = c^2
6,724 = c^2
c^2 = 6,724
c^2 = 82^2
c = plus or minus 82
Since measurements cannot be negative, the length of the hypotenuse is 82 units.
Hope this helps!