Wed February 27, 2013 By:

A boy of height 1.7m is standing 30m away from a flagstaff on the same level ground.He observes that the angle of elevation of the top of the flagstaff is 30 degrees.Calculate the height of the flagstaff.

Expert Reply
Wed February 27, 2013
Draw a figure such that AB represents the height of the flagstaff, CD represents the height of the boy. 
Then, as given in the question, CD = 1.7 m, BD = 30m. Draw a line CE parallel to BD intersecting AB at point E. 
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