Presentation on theme: "10.1 Circles and Circumference"— Presentation transcript:
1 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.
2 VocabularyCircle – 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.ABCDEF
3 Use the figure to answer the questions. Name the circleName a radius of the circle.Name a chord of the circleName a diameter of the circle.ABCDE
4 The diameters of X, Y, and Z are 22 mm, 16mm, and 10mm respectively Find EZFind XFEXYFZG
5 Find C if r=13 cmFind C if d=6 in3. Find d and r to the nearest hundredth if C=65.4 feet.