1. Choose the angle you would like to determine, and choose a trig function to calculate it. Remember that sine equals (opposite / hypotenuse) cosine equals (adjacent / hypotenuse
http://www.ehow.com/how_8453135_measureanglesmat...

A ray in math is a part of a line that has one end point.
http://wiki.answers.com/Q/What_is_a_ray_in_math_te...

A ray is part of a line which is finite in one direction, but infinite in the other. ChaCha!
http://www.chacha.com/question/whatisthemathde...

There is no ray like Ray Charles, in math or music, does not matter. As for the half lines with closed end points, I would have to say infinite. From infinitely many points in space
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