Maths > Coordinate System and Coordinates > 2.0 Rectangular cartesian co-ordinate system
Coordinate System and Coordinates
1.0 Definition
2.0 Rectangular cartesian co-ordinate system
3.0 Polar co-ordinates of a point
4.0 Relation between cartesian co-ordinates and polar co-ordinates
5.0 Distance formulae
6.0 Section formulae
7.0 Area of triangle
8.0 Area of quadrilateral
9.0 Area of $n$- sided polygon
10.0 Centroid of a triangle
11.0 Incentre of a triangle
12.0 Excentre of a triangle
13.0 Circumcentre of a triangle
14.0 Orthocentre of a triangle
15.0 Locus
16.0 Shifting of origin
17.0 Rotation of axes
2.1 Table for conversion sign of co-ordinates
Quadrants | $XOY\ (I)$ | $X'OY\ (II)$ | $X'OY'\ (III)$ | $XOY'\ (IV)$ |
Sign of $x$ co-ordinate | $+$ | $-$ | $-$ | $+$ |
Sign of $y$ co-ordinate | $+$ | $+$ | $-$ | $-$ |
Sign of $(x,y)$ | $(+,+)$ | $(-,+)$ | $(-,-)$ | $(+,-)$ |