trigonometry(opt math)
posted by Anamika .
From the roof and basement of a house 20m high,the angle of elevation of the top of a tower are 45 and 60 degres respectively. Find the height of the tower.
(Ans=81.97m)

h = height of tower
d = distance to tower
h / d = tan(60º)
(h  20) / d = tan(45º)
h / (h  20) = tan(60º) / tan(45º)
h = tan(60º) * (h  20)
h [tan(60º)  1] = 20 * tan(60º)
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