TANGENT ANGLE THEOREM
A tangent is a line that just touches a circle at one point. It always forms a right
angle with the circle's radius as shown here.
angle with the circle's radius as shown here.
![](http://www.mathsisfun.com/geometry/images/angle-tangent.gif)
A Cyclic Quadrilateral's opposite angles add to 180°
a + c = 180°
b + d = 180°
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