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Uknown Angle Problems With Inscribed Angles in circles 

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Uknown Angle Problems With Inscribed Angles in circles 

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The inscribed angle is half of the central angle for a circle.
Inscribed angle that intercept the same arc are equal.

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Arc Length Formula:

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If A, B, and C are three distinct points on a circle and segment AC is a diameter of the circle, then <ABC is a right angle.

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Theroms:
#1) In a circle, or congruent circles, congruent chords are equidistant from the center (converse) In a circle or congruent circles, chords equidistant from the center are congruent

#2) In a circle, parallel chords intercept congruent arcs.

#3) In the same circle, or congruent circles, congruent central angles have congruent angles.

#4) In the same circle, or congruent circles, congruent central angles have congruent chords (converse) In the same circle, or congruent circles, congruent circles, congruent chords have congruent central angles
What to know:

#1) Pythagorean theorem

A^2+B^2=C^2

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The radius goes half way through the circle.

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Rectangles Inscribed in Circles

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The circumference of a circle is 360°

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Minor arc is less than half of the circle. Major arc is more than half the circle.

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The diameter goes through the whole circle.

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The length of an arc piece of circumference.

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A segment whose endpoints are on the circle.

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Number of degrees in an arc

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An angle whose vertex is on the center of the circle.