# Introduction To 3-D Geometry class 11 Notes Mathematics ## myCBSEguide App

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## CBSE Guide Introduction To 3-D Geometry class 11 Notes

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## Introduction To 3-D Geometry class 11 Notes Mathematics

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CBSE Class 11 Mathematics
Revision Notes
Chapter-12
Introduction To 3-D Geometry class 11 Notes Mathematics

1. Coordinates- axes, planes, points in 3D
2. Distance between Two Points
3. Section Formula
• Coordinate axes: In three dimensions, the coordinate axes of a rectangular Cartesian coordinate system are three mutually perpendicular lines. The axes are called the x-axis, y-axis and z-axis.
• Planes: The three planes determined by the pair of axes are the coordinate planes, called XY, YZ and ZX planes.

plane i.e.,

plane i.e.,

plane i.e.,

• Octants: The three coordinate planes divide the space into eight parts known as octants.
• Points in 3D: The coordinates of a point P in three dimensional geometry is always written in the form of triplet like (x, y, z). Here x, y  and z are the distances from the YZ, ZX and  XY
• Distance formula between two points: Distance between two points

Section Formula: The co-ordinates of R which divides a line segment joining the points

Internally and externally in the ratio m : n respectively

Internally:

Externally:

Centroid: The coordinates of the centroid of the trinagle whose vertices are

is

# Introduction To 3-D Geometry class 11 Notes

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