A pole 15 m long rests against a vertical wall at an angle of 30∘ with the ground How high up the wall does the pole reach?
7.5 m
8 m
5 m
7 m
A
5 m
B
7 m
C
7.5 m
D
8 m
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Solution
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The correct option is C7.5 m
As shown in the fig. let AB be the length of the pole.
sin30∘=x15
Or
x=15sin30∘=152=7.5m
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