Marveon
03.08.2019 •
Mathematics
Alighthouse operator sights a sailboat at an angle of depression of 12 degrees. if the sailboat is 80m away, how tall is the lighthouse? best explained answer gets a !
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Ответ:
Based on the figure shown in the attachment, we have a right triangle with the adjacent leg of 80 (this leg is closest to the bottom 12 degree angle) and an opposite leg of h
In short,
adjacent = 80
opposite = h
We'll use the tangent rule
tan(angle) = opposite/adjacent
tan(12) = h/80
80*tan(12) = h
h = 80*tan(12)
h = 17.0045249336018 <<-- see note below
So the lighthouse is roughly 17.0045249336018 meters tall
17.0045249336018
Note: Make sure you are in degree mode. The value is approximate. Round this answer however you need to
Ответ: