Class 12MathematicsThree Dimensional GeometrySystem of co-ordinates, Direction cosines and direction ratios, Projection
MediumIf the projections of a line on the coordinate axes are $2, -1, 2$,then the length of the line is
- A$3$
- B$4$
- C$2$
- D$\frac{1}{2}$
Explore More
Similar Questions
If a line makes angles $90^{\circ}$,$135^{\circ}$,and $45^{\circ}$ with the positive directions of $X$,$Y$,and $Z$-axes respectively,then its direction cosines are:
If a line makes angles $\alpha, \beta, \gamma$ with the coordinate axes,then $\cos 2\alpha + \cos 2\beta + \cos 2\gamma = \dots$
Medium
View SolutionIf the angle between the lines whose direction ratios are $2, -1, 2$ and $a, 3, 5$ is $45^\circ$,then $a =$
Easy
View SolutionFind the acute angle between two lines with direction ratios $2, 3, 6$ and $1, 2, 2$ respectively.
Easy
View SolutionIf $(\alpha, \beta, \gamma)$ are the direction cosines of an angular bisector of two lines whose direction ratios are $(2, 2, 1)$ and $(2, -1, -2)$,then $(\alpha + \beta + \gamma)^2 = $
Vedclass Products
For Students
Vedclass Test Series
Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.
Start Free TrialFor Teachers
Exam Paper Generator
Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.
Try FreeFor Institutes
Online Exam Module
Live online exams with unlimited students, 360° analytics & white-label branding.
See Demo