Oblique intercept: y=kx+b, slope is k, and y-axis intercept is b.

Point oblique type: y-y 1=k(x-x 1) straight line passes through the point (x 1, y 1) with a slope of k.

Intercept formula: x/a+y/b= 1 Intercepts of a straight line on two axes are a and b respectively.

Two-point formula: (y-y1)/(x-x1) = (y2-y1)/(x2-x1) or:

|x y 1|

|x 1 y 1 1|=0

| X2Y2 1 | (X 1, Y 1) and (x2, Y2) are two points where a straight line passes.

Normal formula: xcosα+ysinα-p=0 α is the angle between normal and X axis, and the length of p normal. or

(Ax+By+C)/[ √(A？ +B？ The symbol before ]= 0 is different from the symbol of c, and when c is 0, it is the same as the symbol of b.

Parameter formula:

x=x0+lt

Y=y0+mt slope k=m/l, passing through point (x0, y0).

or

x=x0+tcosα

Y=y0+tsinα α workbench bevel angle