2012 · Q53
A ladder 20 m long is placed against a wall so that the foot of the ladder is 10 m from the wall. The angle of inclination of the ladder to the horizontal will be:
Elementary MathematicsTrigonometry
- A30 degrees
- B45 degrees
- C60 degrees
- D75 degrees
Explanation
cos(angle) = 10/20 = 1/2, so the angle is 60 degrees.