Question 949190
Use the equation a^2 + b^2 = c^2

A is a leg, b is the other leg, c is the hypotenuse.

Plug in what you know:

16^2 + b^2 = 20^2
256 + b^2 = 400
B^2 = 144
B = 12

The length of the other leg is 12 units