Question 971509
measure of angle CAD is 158/2 = 79 degrees.


here's a good reference.


<a href = "http://www.regentsprep.org/regents/math/geometry/gp15/circleangles.htm" target = "_blank">http://www.regentsprep.org/regents/math/geometry/gp15/circleangles.htm</a>


yours looks like number 3 - the tangent chord angle.


<a href = "http://prntscr.com/77f60g" target = "_blank">http://prntscr.com/77f60g</a>