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# Understanding elementary shapes

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Acute, right, & obtuse angles

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Measuring angles in degreesMeasuring angles using a protractorMeasuring angles using a protractor 2Decomposing an angleDrawing acute, right and obtuse angles

Practice

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Classifying triangles Classifying triangles by anglesWorked example: Classifying triangles Types of triangles review

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Intro to quadrilateralRight angles in shapes (informal definition)Identifying quadrilateralsQuadrilateral propertiesQuadrilateral typesClassifying quadrilaterals

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Polygons review