Question
The length of the shadow of a vertical tower increases
by 8 m on horizontal ground when the height of the sun changes from 45° to 30 ° , then find the height of the tower?Solution
AB = 8 m DC = h, BC = x In ∆BCD tan 45 ° = DC/BC = h/x 1 = h/x x = h In ∆ACD tan 30° = DC/AC = DC/(AB + BC) 1/ √3 = h/(8 + x) 1/ √3 = h/(8 + h) 8 + h = √3 h √3 h - h = 8 h ( √3 - 1 ) = 8 h = 8/( √3 - 1) x ( √3 + 1)/ ( √3 + 1) = 4( √3 + 1)
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