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The diagonals of the parallelogram whose...

The diagonals of the parallelogram whose sides are `lx+my+n = 0`,`lx+ my+ n',=0`, `mx+ly+n=0`, `mx+ly+n'=0` include an angle

A

`(pi)/3`

B

`(pi)/2`

C

`tan^(-1)((l^(2)-m^(2))/(l^(2)+m^(2)))`

D

`tan^(-1)((2lm)/(l^(2)+m^(2)))`

Text Solution

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The correct Answer is:
B
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DISHA PUBLICATION-STRAIGHT LINES AND PAIR OF STRAIGHT LINES-EXERCISE 1: CONCEPT BUILDER
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