In this chapter we will discuss about the two as well as three dimensional geometry. We will discuss about the position of the points and locate the point in the plane or on the surface. The three mutually perpendicular lines in the plane is called coordinate axes of the plane. The three numbers in a plane which represents the positions of the point is called coordinate of the point with reference of to the three coordinate planes. There are eight planes in a three dimensional axes called octants. The sign of the various coordinates in the various octants are given below in the table:

Coordinate |
I |
II |
III |
IV |
V |
VI |
VII |
VIII |

X | + | – | – | + | + | – | – | + |

Y | + | – | – | + | + | + | – | – |

Z | + | + | + | + | – | – | – | – |

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