Hi, the problem i have here isn't with my trig skills but with my ability to use similar triangles to prove that KZ = tan.
***Could someone please tell me which triangles to use.***
I know from wikipedia, that this is true.
The above diagram is of a unit circle. Where KZ denotes the length of the segment from the point K to the point Z.
I must prove in general that KZ is the tangent using similar triangles with the Information provided in the first diagram.
It might also help to know that LZ = OJ = cosθ and JZ = OL = sin θ.