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Sum of angles of a triangle

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Sum of angles in quadrilateral

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Sum of angles in Pentagon

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Sum of angles in Hexagon Sorry, the GeoGebra Applet could not be started. Please make sure that Java 1.4.2 (or later) is installed and active in your browser (Click here to install Java now) Leena, Created with GeoGebra

Sum of angles in Heptagon Sorry, the GeoGebra Applet could not be started. Please make sure that Java 1.4.2 (or later) is installed and active in your browser (Click here to install Java now) Leena, Created with GeoGebra

sum of angles of octagon Sorry, the GeoGebra Applet could not be started. Please make sure that Java 1.4.2 (or later) is installed and active in your browser (Click here to install Java now) Leena, Created with GeoGebra