Level 134 Level 136
Level 135

Circle Theorems for Finding Arc & Angle Measures


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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