Answer:use Pythagorean theorem to sole this. The problem gives you the hypotenuse and one side, so you need to find the other side.
Step-by-step explanation: Use
a^2 + b^2 = c^2.
80^2 + b^2 = 100^2
6400 +b^2 = 10000
-6400. -6400
b^2 = 3600
Square root each side of the equation
b = 60