A vertical tower PQ subtends th same angle `30^(@)` at each of two place A and B, 60 m apart on the
Channel: Doubtnut
Date: 24/05/2020

A vertical tower PQ subtends th same angle `30^(@)` at each of two place A and B, 60 m apart on the ground, AB subtends an angle `120^(@)` at the foot of the tower. If h is the height of the tower, then `9h^(2)+h+1` is equal to