From the top of a house, the angle of depression of a point on the ground is 18.5°. The point is 43 meters from the base of the building. How high is the building?
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angle of depression= 18.5°
distance from the base of the building= 43 m
in 18.5°+90°+x°= 180°
x= 180-(18.5°+90°)= 180-108.5=71.5°
tan71.5°=2.98868( from table)
tan71.5= height of the building/distance from the base
height of th building= tan71.5°x43= 2.98868x43=128.51 mt
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