Trigonometrymedium · Past Paper
Angle of elevation of a tower from a point is 45°. Moving 10 m away, it becomes 30°. Height?
A5(√3+1) m
B10(√3-1) m
C10 m
D5 m
✓ Correct Answer: A — 5(√3+1) m
h/h = tan 45. h/(h+10) = tan 30 = 1/√3. h√3 = h + 10 => h = 10/(√3-1) = 5(√3+1).
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