Trigonometryhard · Past Paper
From a point on a bridge across a river, angles of depression of the banks on opposite sides are 30° and 45°. If bridge is 3 m high, find river width.
A3(√3+1) m
B3√3 m
C6 m
D4 m
✓ Correct Answer: A — 3(√3+1) m
Width = 3/tan 30 + 3/tan 45 = 3√3 + 3 = 3(√3+1) m.
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