Trigonometry
posted by Roy .
A ladder 5 meter long leans against the wall of an apartment house forming an angle of 50 degrees, 32 minutes with the ground. how high up the wall does it reach?

sin theta = H / L = H / 5
H = 5 * sin theta = 5 * sin 50 ° 32 ´
H = 5 * 0.77199
H = 3.85995 m approx. H = 3.86 m
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