A ladder leaning against a building makes an angle of 65 degrees with the ground and reaches a point on the building 20 feet above the ground. what is the length of the ladder to the nearest foot.
22 feet. Using the sine rule theory: 20/sin(65)=x/sin(90). You know that it's 90 degrees because you assume the ground and the building make a 90 degree angle. So, you cross multiply and get 20sin(90)/xsin(65) and solve for x.
