Hi
First of all, a little review about similarity. Take a look at the problems and try one or two of them.
http://betahome.biz/file/T2k/10-7-similar-figures-glencoe.html
And some exercises about trigonometry. We did some of them (they are in your book). Try some more, for example, numbers 22, 23, 24, 31, 36, 38 and 39. The answers are at the end. Use your notebook, but send me one of them by email.
http://yoquieroaprobar.es/3_eso/4/trigonometria_16.pdf