2009
Mathematics
JAMB
A cliff on the bank of a river is 300 meter high. if the angle of depression of a point on the opposite side of the river is 60º, find the width of the river?
A.
100m
B.
75√3 m
C.
100√3m
D.
200√3m
Correct Answer: 100√3m
Explanation
Tan 60 = 300/x x =300/Tan 60 x =300/√3 x = (300/√3) x (√3/√3) x =300√3/.....3 x = 100√3
Tan 60 = 300/x x =300/Tan 60 x =300/√3 x = (300/√3) x (√3/√3) x =300√3/.....3 x = 100√3THIS WEEK's
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