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Unit 9 Circles (Parabola (axis of symmetry (x=h), directrix (a fixed line…
Unit 9 Circles
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Postulates and Theorems
In the same circle or in congruent circles, two minor arcs are congruent if and only if their central angles are congruent
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If a line in the plane of a circle is perpendicular to a radius at its outer endpoint, then the line is tangent to the circle
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Secants, Chords, and Tangents
Secants
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The measure of an angle formed by two secants that intersect in the exterior of a circle is one-half the difference of the measures of the intercepted arcs.
Chords
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Chords and Arc Theorem
In a circle, or in congruent circles, the arcs of congruent chords are congruent
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Radians and Degrees
Radians
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a unit of angle, equal to an angle at the center of a circle whose arc is equal in length to the radius
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