A boy

A boy of height 1.7m is standing 30m away from flag staff on the same level ground . He observes that the angle of deviation of the top of flag staff is 30 degree. Calculate the height of flag staff.

Correct result:

h =  19.0205 m


a=30 m b=1.7 m A=30   tanA=x/a  h=b+a tan(A rad)=b+a tan(A π180 )=1.7+30 tan(30 3.1415926180 )=19.021=19.0205 m

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