Question 1181002
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A boy of height 1.7m is standing 20m away from a flag staff on the same level ground. 
He observed that the angle of elevation of the top of the flag staff is 24degree. 
Calculate the height of the flag staff
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<pre>
    = 1.7 + 20*tan(24°) meters.
</pre>

Having the formula from me, you do the rest.