Answer:
B. 16
Step-by-step explanation:
a2 x b2 = c2 (pythag theorem)
We have the longest value (hypotenuse) opposite of the 90 degree angle, so 20 is C. 12 can be plugged in for either A or B
12^2 x b^2 = 20^2 (plug in for values)
144 x b^2 = 400 (simplify)
b^2 = 256 (subtract)
b = 16 (square root)
Answer: 16
