### Mathematics Class XI

Unit-I: Sets and Functions
Chapter 1: Sets
Unit-II: Algebra
Chapter 5: Binomial Theorem
Unit-III: Coordinate Geometry
Chapter 1: Straight Lines
Chapter 2: Conic Sections
Unit-IV: Calculus
Unit-V: Mathematical Reasoning
Unit-VI: Statistics and Probability
Chapter 1: Statistics
Chapter 2: Probability

# Projection of a segment on a line or a plane

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If are projections of on a given line or plane, then is the projection of the segment on the given line or plane.

Distance between Two Points in Space:

The distance between the points & is given by

Note:

Distance of from  origin is given by .

If are projection of on -axes, then respectively.

(i) Example:

Given and  be two points in space. Then

(ii) Example:

Given be a point in space, Then its distance from origin is

(iii) Example:

Let are projections of on and -axes respectively, then

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