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A spire stand directly across the street from a building. The angle of depression of the top of the building from the top of the spire is #25.8^0# and the angle of elevation of the top of the spire from the foot of the building is #43.5^0#. given that the distance between the spire and the building is 40 metres,
calculate to two decimal places:
a)The height of the spire.
b)The difference in height between the spire and the building.
c)The height of the building.
d)The angle of elevation of the top of the building from the foot of the spire.