Trigonometryhard · Past Paper
Length of a shadow of a vertical tower on level ground increases by 10 m when altitude of sun changes from 45 to 30. Height?
A5(√3+1) m
B10(√3+1) m
C5√3 m
D10 m
✓ Correct Answer: A — 5(√3+1) m
h(cot 30 - cot 45) = 10. h(√3 - 1) = 10. h = 10/(√3-1) = 5(√3+1).
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