STRAIGHT LINES | DISTANCE OF A POINT FROM A LINE, DISTANCE BETWEEN PARALLEL LINES, AREA OF THE PARALLELOGRAM, DISTANCE FORM OF A LINE, EQUATIONS OF BISECTORS OF THE ANGLE BETWEEN THE LINES | Prove that the length of perpendicular from a point `(x_1,y_1)` to a line `ax+by+c=0` is `|(ax_1+by_1+c)/(sqrt(a^2+b^2))|`., 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))`., Find the area of the parallelogram ., Line passing through a point and making a given angle with a line ., Formula and Methods to determine acute and obtuse angle bisector ., Shortcut method to determine acute and obtuse angle Bisectors., Determine Bisector of angle containing origin and not containing origin .