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Find unknown angle measurements of quadrilaterals with two pairs of parallel sides.
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Quadrilaterals and Polygons
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Overview of Parallel Lines
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An Overview of Parallel Lines
MAT.GEO.301 (Identify Line Types - Elementary Math Grade 3)
MAT.GEO.301 (Counting the Number of Perpendicular Lines - Elementary Math Grade 5)
MAT.GEO.504.01 (Parallelograms - Geometry)
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