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an angle whose vertex is the center of the circle
chord-chord angle (inside the circle not at the center)
the measure of an angle whose vertex is inside the circle is 1/2 the sum of the measures of the intercepted arcs: x=1/2(a+b)
angle drawn inside of a circle, with its vertex on the circle.
an angle formed by a chord of the circle and a tangent of the circle whose vertex is on the circle.
an angle created by two secants whose vertex is outside the circle.
an angle created by two tangents whose vertex is outside the circle
an angle created by a secant and a tangent whose vertex is outside the circle