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**10.1 Circles and Circumference**

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

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Vocabulary 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. A B C D E F

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**Use the figure to answer the questions.**

Name the circle Name a radius of the circle. Name a chord of the circle 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**

Find EZ Find XF E X Y F Z G

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Find C if r=13 cm 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 even

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M5G2 – Students will understand the relationship of the circumference of a circle, its diameter, and pi (pi ≈ 3.14)

M5G2 – Students will understand the relationship of the circumference of a circle, its diameter, and pi (pi ≈ 3.14)

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