ਪ੍ਰਦੂਸ਼ਣ ਦੇ ਬਚਾਅ ਤੇ ਉਪਾਅ ਦੱਸੋ (ਲੇਖ)
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A quadrilateral has 4 sides, 4 angles and 4 vertices. A quadrilateral can be regular or irregular. The sum of all the interior angles of a quadrilateral is 360°. Quadrilaterals can be classified into Parallelograms, Squares, Rectangles and Rhombuses
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