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

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

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9–5QuadrilateralsMAIN IDEA• Classify quadrilateralsand find missingangle measures inquadrilaterals.BUILD YOUR VOCABULARY (pages 219–220)A quadrilateral has sides and angles.EXAMPLE Find Angle MeasuresKEY CONCEPTFind the value of x in the quadrilateral shown.Angles of a QuadrilateralThe sum of the measureof the angles of aquadrilateral is 360°.Since the sum of the angle measures in a quadrilateral is 360°,x + 50 + 130 + 50 = 360.x + 50 + 130 + 50 = 360Write the equation.x + = 360 Add 50, 130, and 50.THINK What measure addedto 230 equals 360?+ 230 = 360 You know that + 230 = 360.So, the value of x is .Check Your Progress Find the value of x in thequadrilateral shown.Copyright © Glencoe/<strong>McGraw</strong>-<strong>Hill</strong>, a division of The <strong>McGraw</strong>-<strong>Hill</strong> Companies, Inc.230 Math Connects, Course 1

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