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Noteables Interactive Study Notebook (26491.0K) - McGraw-Hill ...

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10–2Circles and CircumferenceMAIN IDEA• Estimate and findthe circumference ofcircles.BUILD YOUR VOCABULARY (pages 241–242)A circle is the set of allin a plane that are thesame distance from acalled the center.KEY CONCEPTRadius and DiameterThe diameter d of a circleis twice its radius r. Theradius r of a circle is halfof its diameter d.A chord is any segment with bothThe diameter is the distanceits center.The radius is the distance from thepoint on a circle.on the circle.a circle throughto anyThe circumference is the distancea circle.Copyright © Glencoe/<strong>McGraw</strong>-<strong>Hill</strong>, a division of The <strong>McGraw</strong>-<strong>Hill</strong> Companies, Inc.EXAMPLE Find the RadiusThe diameter of a circle is 48 centimeters. Find theradius.r =Write the formula.r = Replace d with 48.r =The radius isDivide.centimeters.Check Your Progress The radius of a circle is 22centimeters. Find the diameter.Math Connects, Course 1 245

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