Question

What is the perimeter?
Help plz...And No links!!I repeat No links!!

Answer 1

36 units

Explanation:

First calculate the length of side a. Using the Pythagorean Theorem, we find that 15^2 = 12^2 + x^2, or 225 - 144 = x^2. Thus, x^2 = 81 and the length of side a is √81, or 9, units.

Then the perimeter is the sum of all three side lengths:

15 + 9 + 12 = 36 units