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Unit 6 Day 1 Circle Vocabulary

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In your pairs look up the definitions for your vocabulary words.

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Circle All points equidistant from a given point called the center

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Semicircle Half of a circle (Arc of a circle that measures 180 ⁰ )

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Radius A segment from the center to a point of the circle *Note all radii of the same circle are congruent

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Diameter A special chord that passes through the center

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Chord A segment whose endpoints are on the circle

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Secant A line which intersects the circle in two points

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Tangent A line which intersects the circle in one and only one point

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Arc Major Arc- Arc that measures greater than 180˚ Minor Arc- Arc that measures less than 180˚ A portion of the circumference of a circle

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Sector The interior formed by a central angle and its intercepted arc (“pie” shape)

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Circle: Chord: Radius: Diameter: Secant: Tangent: Major Arc: Minor Arc: Semicircle: Label one of each using the picture given:

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