1. Two forces, 80N and 100N, acting at an angle of 60deg with each other, pull on an object. a) what single force would replace the two forces? r^2=(x^2 + y^2)^2 , sinΘ, cosΘ 3. The attempt at a solution I actually got the correct answer by using an angle of 0 degrees for 80N and 60 degrees for 100N finding the x and y sums and using the pythagorean theorem. 156N at 34° I am the victim of a lucky guess. I have no idea why I was actually to use 0 degrees instead of another value. What is the definitive reason behind why it worked?