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6 
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two or more circles with the same radius 
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7 
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the angle with its vertex at the center of the circle 
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8 
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the two points that mark the end of an arc 
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9 
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the point where the tangent touches the circle 
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10 
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an arc of a circle that is larger than a semicircle 
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11 
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the same measure as the measure of the central angle 
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12 
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the set of all points in a plane that is a given distance from a given point 
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13 
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an arc of a circle whose endpoints are the endpoints of a diameter; half of a circle 
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