



 
Hi Joyce. Here's a sketch which draws a right triangle that is our geometric object of interest: So you want an angle in a right triangle and you know the lengths of the opposite side and the hypotenuse of the triangle. What trigonometric function have you studied that has an angle, the opposite side and the hypotenuse? Hope this helps,  


Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences. 