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Prove that distance between two parallel...

Prove that distance between two parallel lines `ax+by+c_1=0` and `ax+by+c_2=0` is given by `|c_1-c_2|/(sqrt(a^2+b^2))`

A

`|(c_(1)+c_(2))/(sqrt(a^(2)+b^(2)))|`

B

`|(c_(1)-c_(2))/(sqrt(a^(2)+b^(2)))|`

C

`|(c_(1)-c_(2))/(sqrt(a^(2)-b^(2)))|`

D

`|(c_(1)-c_(2))/(sqrt(a^(2)+b^(2)))|`

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The correct Answer is:
A
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