The figure below ahows the right teiangle XYz. WICH of this ratios can be used to find the cosine of the angle corresponding to 0 in a similar right triangle XY/XZ XY/YZ YZ/XZ XZ/XY

The figure below ahows the right teiangle XYz WICH of this ratios can be used to find the cosine of the angle corresponding to 0 in a similar right triangle XYX class=