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Question

Assertion :The diagonals of the parallelogram whose sides are lx+my+n=0,lx+my+n′=0,mx+ly+n=0,mx+ly+n′=0 are perpendicular. Reason: If the perpendicular distances between parallel sides of a parallelogram are equal, then it is a rhombus.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Assertion is incorrect but Reason is correct
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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Reason is correct
Assertion:
Line lx+my+n=0 and lx+my+n=0 are parallel with distance between then is
nnl2+m2 ...(1)
And lines mx+ly+n=0 and mx+ly+n=0 are parallel with distance between them is
nnm2+l2 ...(2)
From (1) and (2) assertion is true

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