Do you know what to do here? (basic trig)

[Stuwie]

http://i.4cdn.org/sci/1422268953865.jpg

 

[NascentOxygen]

Hello Stuwie. Welcome to Physics Forums.

This "New Member Introductions" forum is for introducing yourself (and testing that your messages are posting okay). If you wish to ask technical questions, please choose a forum appropriate to that, and not this one. A good habit to adopt is to always look through some existing threads in any forum before you begin your own thread, that way you make a preliminary check that it is going to be appropriate.

Choose from those available for homework-type questions here: https://www.physicsforums.com/forums/homework-and-coursework-questions.152/