The document describes a scenario where a tower subtends a certain angle when viewed from a point 160m from its base, and when the viewing point advances 100m closer, the angle subtended is twice as large. Based on this information about angular size changing with distance from the tower, the document determines the height of the tower is 80m.

13. • A tower standing on a horizontal plane subtends
a certain angle at a point 160 m apart from the
foot of the tower. On advancing 100 m towards it,
the tower is found to subtend and angle twice as
before. The height of the tower is
A) 80 m
B) 100 m
C) 160 m
D) 200 m
• Ans.:- 80 m

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