A triangle with side 8 inches and corresponding angle 13 degrees, side x inches and corresponding angle 120 degrees.

To answer this I set up a proportion:

$\sin \left(13\right)/8=\sin \left(120\right)/x$

$x\sin \left(13\right)=8\sin \left(120\right)$

$x=8\sin \left(120\right)/\sin \left(13\right)$


The information from the triangle is right, but the answer is not listed, as it should be. Have I done something wrong mathematically or is the book wrong.


If you're setting up your triangle as follows, then you're correct.

enter image description here

  • 1
    $\begingroup$ Yes, That's how I set it up. $\endgroup$ – Diamond Louis XIV Apr 24 '15 at 2:11

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.