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Published byCecily Small Modified over 8 years ago

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10.1 Circles

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Definition:

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Although all circles have the same shape, their sizes are determined by the measures of their radii. Two or more coplanar circles with the same center are called concentric circles.

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Two circles are congruent if the have the same radii. A point is inside (in the interior of) a circle if its distance from the center is less than the radius. interior O A Point O and A are in the interior of Circle O.

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A point is outside (in the exterior of) a circle if its distance from the center is greater than the radius. A W Point W is in the exterior of Circle A. A point is on a circle if its distance from the center is equal to the radius. S Point S is on Circle A.

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Chords and Diameters: Points on a circle can be connected by segments called chords. A chord of a circle is a segment joining any two points on the circle. A diameter of a circle is a chord that passes through the center of the circle. The longest chord of a circle is the diameter. chord diameter

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Formulas to know! Circumference: C = 2 r or C = d Area = r 2

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