Sum of angles in a quadrilateral is 360 degrees: visual proof
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4 non-collinear points forming a quadrilateral
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Exterior angles of a quadrilateral is 180 degrees
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Interior and exterior angles of a quadrilateral
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Angle measures in a quadrilateral
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Rectangle PQRS
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Parallelogram ABCD
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Square PQRS
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Rhombus PQRS
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Quadrilateral family
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