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A boy standing on the top of a tower 20 metrés height, saw the top of a building at an elevation of `50^circ` and its base at a depression of `30^circ `
a) Draw a rough figure. according to the given data.
b) find the distance between the tower and the building.
c) find the distance from the top of the tower to the base of the building.
d) find the height of the building.
[sin `50^circ`=0.77, cos `50^circ`=0.64, tan `50^circ`=1.2, 'sqrt3`=1.7]

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