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If theta is the acute angle between the ...

If `theta` is the acute angle between the lines with slopes m1 and m2 then `tantheta = (m_1 -m_2)/(1+m_1m_2)`.If p is the length the perpendicular from point P(x1, y1) to the line ax+ by +c =0 then p= `(ax_1+by_1+c)/(sqrt(a^2+b^2))`

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RD SHARMA ENGLISH-THE STRAIGHT LINES -All Questions
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