Question

The angle of elevation of the top of a building from a point on the ground is 60°. After walking 20 meters towards the building, the angle of elevation becomes 75°. Find the initial distance from the point on the ground to the building.

A 10(√3-1) meters
B 10(√3+1) meters
C 10(√3+2) meters
D 10(√3-2) meters
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