please take a look at this image http://a.imageshack.us/img715/8526/paint2.jpg [Broken] there are 2 triangles. in these triangles r1,a,theta1 r2,a,theta2 are given. x1 and x2 are unknown. also the angle k is same for both triangles. i need to find this k. also i have data to draw series of tingles like these 2(i know r3,theta3,a ....etc). and all of them have the angle k. how to find it??