If the diagonal of a quadrilateral bisect each other at 90°, then prove that it is a rhombus
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In Triangle AOB and COD
AO=OC (diagonal bisect)
ANGLE AOB=ANGLE COD(VERTICALLY OPPOSITE)
OB=OD(DIAGONAL BISECT)
BOTH TRIANGLE ARE CONGRUENT BY SAS
AND AB=CD (BY CPCT)
SIMILARLY AD=BC
IN TRIANGLE AOB nd AOD
OB=OD( DIAGONAL)
ANGLE AOD=ANGLE AOB(90°)
AO(COMMON)
BOTH TRIANGLE ARE CONGRUENT BY SAS nd AD=AB BY CPCT
AO AB=BC=CD=AD
(HENCE PROVED)
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