Maths In Focus Prelim Ex 6.14, Q8 (1 Viewer)

fifibum

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I'm working from the Maths In Focus prelim ext. 1 textbook (Grove)
and am so stuck on ex 6.14, question 8...cosine rule doesn't seem to be
working...help!
 

si2136

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I'm working from the Maths In Focus prelim ext. 1 textbook (Grove)
and am so stuck on ex 6.14, question 8...cosine rule doesn't seem to be
working...help!
Have you tried drawing a diagram to begin with?
 

eyeseeyou

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Post this in the maths forum. Not here (the extension 1 maths thread)
 

Dragon9000

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It is an extension 1 question, with 3D trig.

I'll try and solve it when I get back
 

Dragon9000

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Tell/Show us the question, we dont all have MIF
David walks along a straight road. At one point he notices a tower on a bearing of 053° with an angle of elevation of 21°. After walking 230 m, the tower is on a bearing of 342°, with an angle of elevation of 26°. Find the height of the tower correct to the nearest metre.

I'm not OP, but I didn't really know where to start, I drew a shit diagram though.
 

Nicfryk

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Why doesn't it work if I use the Sine Rule to find your x and y above and then substitute those into the tan ratio?
 

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