What are some straight lines important formulas for class 12th .
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Formulas and Results of Straight Lines
The distance formula |PQ|=√(x2–x1)2+(y2–y1)2.
The midpoint formula ¯PQ=(x1+x22,y1+y22)
The point R(x,y) dividing ¯PQ in the ratio k1k2 is x=k1x2+k2x1k1+k2,y=k1y2+k2y1k1+k2.
The slope of ¯PQ is m=y2–y1x2–x1.
The slope of the x-axis = zero.
The slope of a line parallel to the x-axis = zero.
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