Quadrants And Graphs

Quadrants And Graphs
Quadrants: 
    Two mutually perpendicular straight lines XOX’ and YOY’ divide the plane into four equal parts, each part is called quadrant. Thus XOY, YOX’, X’OY’ and Y’OX are called the Ist, IInd, IIIrd and IVth quadrants respectively.

In anti-clockwise direction in first quadrant the angle vary from 0^o to 90^o, in second quadrant from 90^o to 180^o, in third quadrant vary from 180o to 270o and in fourth quadrant the angle vary from 270^o to 360^o. 
Rectangular Co-ordinates and Sign Convention: 
    In plane geometry the position of a point can be fixed by measuring its perpendicular distance from each of two perpendicular called co-ordinate axes. The horizontal line (x-axis) and the vertical line(y-axis). 
        Distance measured from the point O in the direction OX and OY are regarded as positive, while in the direction of OX’ and OY’ are considered negative.