The angle of elevation of the top of a tower from a point at a distance 40 m from the foot of the tower is 45°. Then the height of the tower is
The angle of elevation of the top of a tower from a point at a distance 40 m from the foot of the tower is 45°. Then the height of the tower is
A) 20 m
B) 40 m
C) 40 √2 m
D) 40 √3 m
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