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If the equation `ax^2+2hxy+by^2+2gx+2fy+c=0` represents a pair of parallel lines, then the distance between them is

A

`2sqrt((g^2-ac)/(h^2+a^2))`

B

`2sqrt((g^2+ac)/(h^2+a^2))`

C

`3sqrt(((g^2+ac)/(a(a+b)))`

D

`3sqrt(((g^2-ac)/(a(a+b)))`

Text Solution

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The correct Answer is:
A
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