math help: hey i need help with this math question that i got. - Help.com



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hey i need help with this math question that i got.

If anyone can solve please show how:

Given that H is the height of a vertical tower TO with base O. Two points A and B are on the same plane as O such that A is south of O and B is east of O. The angles of elevation of T from A and B are 38 and 29 degrees respectively. The distance AB is 50 meters.Calculate H.

Your help is supremely appreciated! ^_^

This open post was written 5 months, 2 weeks ago | V/U/S: 101, 6, 2 | Edit Post | Leave a reply | Report Post


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phantom01 offline Unverified User #
An Unknown Location | 5 months, 2 weeks ago (2 minutes after post)

by the way its solid trigonometry (3d)

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jh14591 offline Verified User (1 year) Long Term User Shouts: 3 #
An Unknown Location | 5 months, 2 weeks ago (12 minutes after post)

http://books.google.com/books?id=VzIW…

This link should help you. Did your teacher talk to you about what formula you are supposed to be using?

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phantom01 offline Unverified User #
An Unknown Location | 5 months, 2 weeks ago (14 minutes after post)

no he didnt say but we normally use the sine and cossine rule

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jh14591 offline Verified User (1 year) Long Term User Shouts: 3 #
An Unknown Location | 5 months, 2 weeks ago (17 minutes after post)

then you should use sine and cosine to determine the length of ob and the angle of ot. From there you can determine the length of h. by creating the invisible line bt. I think.

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phantom01 offline Unverified User #
An Unknown Location | 5 months, 2 weeks ago (26 minutes after post)

yea but we weren’t given the angles for triangle OBA so i dont know how to find OB.

the only angles given were the angles of elevation

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jh14591 offline Verified User (1 year) Long Term User Shouts: 3 #
An Unknown Location | 5 months, 2 weeks ago (42 minutes after post)

okay well if b is directly east, and a is directly south then o must be a right angle for triangle oba. If this is the case o is also a right angle for tob since a is directly south of o following the same line. In that case if the angle of elevation is 29 degrees from t to b, then you now know two of the angles for a right triangle tob. If this is the case, then you can find the other angle easily since triangles angles must equal 180, right? and if this is the case you can use those angles to find the lengths of your triangle.

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