osha requires a ladder to meet the ground at 75 degree angle in order to function as safely as possible. of you need the ladder
to reach a ledge 20 feet up a vertical wall, how long does the ladder need to be?
1 answer:
Draw a right triangle with a right angle and a 75 deg angle at the bottom.
The hypotenuse is the length of the ladder.
sin A = opp/hyp
sin 75 = 20/hyp
hyp = 20/sin 75 = 20.7
Answer: 20.7 ft
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