3. Prove that the quadrilateral formed by joining the mid-points of the adjacent sides ofa rectangle is a parallelogramSummarylat surfaces are known as planes.hapes obtained by moving a tip of a pencil on the sheet of paper from one point tther, without lifting the pencil are called plane curveshe curves which have different beginning and end points are called open curves.he curves which have same beginning and end points are called closed curves.e itcalf at any noint icalled a simplecurve

3. Prove that the quadrilateral formed by joining the mid-points of th

1.	3. Prove that the quadrilateral formed by joining the mid-points of the adjacent sides ofa rectangle is a parallelogramSummarylat surfaces are known as planes.hapes obtained by moving a tip of a pencil on the sheet of paper from one point tther, without lifting the pencil are called plane curveshe curves which have different beginning and end points are called open curves.he curves which have same beginning and end points are called closed curves.e itcalf at any noint icalled a simplecurve
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