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Opposite side are equal in parallelogram
Quadrilaterals - Part 4 - Opposite side are equal in parallelogram
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Opposite angles are equal in parallelogram
Quadrilaterals - Part 5 - Opposite angles are equal in parallelogram
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Diagonal of rhombus are perpendicular
Quadrilaterals - Part 7 - Diagonal of rhombus are perpendicular
Free