The hypotenuse of triangle ACB is 29. Leg "a" is 21. What is leg "b"?
The Pythagorean Theorem: a2 + b2 = c2
So: 212 + b2 = 292
Simplifying: 441 + b2 = 841
Subtracting: b2 = 400
Finding the square root: b = 20 (ignoring the negative answer)