1. OSHA is an agency responsible for workplace safety, read its rule and sketch a diagram that shows the proper relationship between the ladder, wall and ground

Non-self-supporting ladders, which must lean against a wall or other support, are to be positioned at such an angle
that the horizontal distance from the top support to the foot of the ladder is about the working length of the ladder.

2. Calculate the angle that the ladder makes with the ground using a trigonometric ratio.