Q5 of 45 Page 138

Prove the following.

Taking LHS



Dividing numerator and denominator by cosθ







[As sec2θ - tan2θ = 1]



= RHS


Proved.


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A boy standing at a distance of 48 meters from a building observes the top of the building and makes an angle of elevation of 30°. Find the height of the building.

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From the top of the light house, an observer looks at a ship and finds the angle of depression to be 30°. If the height of the light-house is 100 meters, then find how far the ship is from the light-house.