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10.1 Circles and Circumference What you’ll learn: 1.To identify and use parts of circles. 2.To solve problems involving the circumference of a circle.

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Circle – the set of all points in a plane equidistant from a given point called the center of the circle. Symbol: Named by the center Radius – the distance from the center to the circle (all radii in a circle are equal) Chord – a segment that connects 2 point on a circle. Diameter – a chord that goes through the center. Circumference – the distance around a circle. Formula: C=πd and C=2πr. Vocabulary A B C D E F

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Use the figure to answer the questions. 1.Name the circle 2.Name a radius of the circle. 3.Name a chord of the circle 4.Name a diameter of the circle. A B C D E

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The diameters of X, Y, and Z are 22 mm, 16mm, and 10mm respectively A.Find EZ B.Find XF EX Y F Z G

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1.Find C if r=13 cm 2.Find C if d=6 in 3.Find d and r to the nearest hundredth if C=65.4 feet.

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Find the exact circumference of K. C=πd C=6π K

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Homework p.526 16-54 even

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