# trig hmwk

• Jan 30th 2008, 06:38 PM
Revelsyn
trig hmwk
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• Jan 30th 2008, 06:41 PM
topsquark
Quote:

Originally Posted by Revelsyn
here's a question that i was so sure i was doing right but everytime the answer comes out as 'error' ><

http://i33.photobucket.com/albums/d5...Untitled-1.jpg

"find the measure of angle θ"

here's what i did: sin52.3 = 11.7/x
sinθ = 14.79/14.6
then i get error
The book says the answer is: 52.7 degrees

For starters, I'm getting x = 13.9, not 14.79. The reason you are getting an error is that your sin(theta) as you have written it, is greater than 1. Where exactly you are going wrong I can't say.

-Dan
• Jan 30th 2008, 08:17 PM
mr fantastic
Quote:

Originally Posted by Revelsyn
here's a question that i was so sure i was doing right but everytime the answer comes out as 'error' ><

http://i33.photobucket.com/albums/d5...Untitled-1.jpg

"find the measure of angle θ"

here's what i did: sin52.3 = 11.7/x Mr F says: Correct.
sinθ = 14.79/14.6 Mr F says: Logically correct. See my main reply.

then i get error Mr F says: For exactly the reason that topsquark stated - "your sin(theta) ..... is greater than 1." But this is NOT your fault. See my main reply.

The book says the answer is: 52.7 degrees Mr F says: Book, schmook. The book is wrong.

The data the book has supplied in its diagram is geometrically impossible. In a right-triangle, you can't have a hypotenuse (14.6 m) shorter than one of the other sides (14.79 m). (Puke) I say.

It's geometrically impossible for the angle at E to be a right angle if DG = 14.6 and triangle EFG is as given ..... Alternatively, DG = 14.6 is geometrically impossible if the angle at E is a right angle and triangle EFG is as given ......

One of the following is clearly wrong (perhaps a misprint): 11.7 m, 14.6 m, 52.3 degrees.

PS: topsquark, x = 14.79 is correct ...... I'd almost guess that you were in radian mode by mistake except you'd get 13.08, not 13.9 ...... Maybe radian mode and bad light ...... ;)
• Jan 30th 2008, 09:25 PM
topsquark
Quote:

Originally Posted by mr fantastic

PS: topsquark, x = 14.79 is correct ...... I'd almost guess that you were in radian mode by mistake except you'd get 13.08, not 13.9 ...... Maybe radian mode and bad light ...... ;)

(grumbles) That's two tonight. (Doh) I really am going to bed now.

-Dan
• Jan 30th 2008, 09:27 PM
mr fantastic
Quote:

Originally Posted by topsquark
(grumbles) That's two tonight. (Doh) I really am going to bed now.

-Dan

(Rofl) Either that or turn the light up.