Level 134
Level 136

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Central Angle

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)

inscribed angle

angle drawn inside of a circle, with its vertex on the circle.

tangent-chord angle

an angle formed by a chord of the circle and a tangent of the circle whose vertex is on the circle.

secant-secant angle

an angle created by two secants whose vertex is outside the circle.

tangent-tangent angle

an angle created by two tangents whose vertex is outside the circle

secant-tangent angle

an angle created by a secant and a tangent whose vertex is outside the circle