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1. Prove that “If the diagonals …

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1. Prove that “If the diagonals of a quadrilateral bisect each other, then it is a parallelogram.” 2. Prove that “: If in a quadrilateral, each pair of opposite angles is equal, then it is a parallelogram.” 3. E and F are points on diagonal AC of a parallelogram ABCD such that AE = CF. Show that BFDE is a parallelogram. 4. ABCD is a rhombus in which altitude from D to side AB bisects AB. Find the angles of the rhombus.
  • 1 answers

Gaurav Seth 3 years, 11 months ago

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Prove that if the diagonals of a quadrilateral bisect each other, then it is a parallelogram.

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OA = OC and OB = OD [Given]

AOB = DOC [vertically opp. angles]

 [SAS congruence]

Therefore ABO = CDO (cpct)

From this, we get AB||CD ...(i)

Similarly BC||AD ...(ii)

 From (i) and (ii) ABCD is a ||gm.

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