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.
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)