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December 18, 2014

December 18, 2014

Posted by **Anonymous** on Wednesday, January 23, 2013 at 11:35am.

A pole projecting outwards and upwards from the bottom of the window makes an angle of 30 degrees with the wall.

If the angle of elevation of the top of the pole observed from the same point on the ground is 60 degrees, what is the the length of the pole?

- maths -
**Steve**, Wednesday, January 23, 2013 at 12:34pmAh, such carefully contrived angles.

Label the

point on the ground Q

base of the wall A

bottom of the window B

top of the pole P

∆ABQ is a 30-60-90 ∆, so BQ=20

∆BPQ is also 30-60-90, so BP=20/√3

so, the pole is 20/√3 = 11.5m

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