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2015-02-05T17:37:28+08:00

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d= \frac{Ax_{1} + By_{1} +C}{\sqrt{A^{2} + B^{2}}}

where x1 and y1 is the coordinate of the point (x1,y1)
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2015-02-05T18:17:34+08:00
Just measure it using protractor
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