Question 1201106
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A vertical aerial AB 9.6m high stands on ground which is inclined 12 degrees to the horizontal. 
A stay connects the top of the aerial A to a point C on the ground 10m downhill from B the foot of the aerial. 
Determine the length of the stay and the angle the stay makes with the ground.
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@CPhill copy-pasted the solution by @mananth and placed it under his name (even without acknowledgment).


So, both "solutions" by @CPhill and by @mananth are identical and both incorrectly interpret the given conditions,

so both solutions are incorrect. The problem says 

"A stay connects the top of the aerial A to a point C on the ground 10m {{{highlight(downhill)}}} from B the foot of the aerial",

but @mananth interpreted in his solution as if

"A stay connects the top of the aerial A to a point C on the ground 10m {{{highlight(uphill)}}} from B the foot of the aerial".


For correct solution, see the post by @ikleyn at this spot.


Ignore both posts by @CPhill and @mananth - their solutions both are irrelevant to the given problem.