Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • School
  • Provide Solution for RD Sharma Class 12 Chapter 27 Straight Line in Space Exercise Very Short Answer Question 21

Provide Solution for RD Sharma Class 12 Chapter 27 Straight Line in Space Exercise Very Short Answer Question 21

Answers (1)

Answer:

Required angle is  \frac{\pi}{2}

Hint:

Use equation of a line in space.

Given:

 2 x=3 y=-z \text { and } 6 x=-y=-4 z

Solution:

The equation of the given lines can be rewritten as,

\frac{x}{3}=\frac{y}{2}=\frac{z}{-6} \text { and } \frac{x}{2}=\frac{y}{-12}=\frac{z}{-3}

We know that angle between the lines

\frac{x-x_{1}}{a_{1}}=\frac{y-y_{1}}{b_{1}}=\frac{z-z_{1}}{c_{1}} \text { and } \frac{x-x_{2}}{a_{2}}=\frac{y-y_{2}}{b_{2}}=\frac{z-z_{2}}{c_{2}}    is given by,

\cos \theta=a_{1} a_{2}+b_{1} b_{2}+c_{1} c_{2}

Let,

\theta=\frac{a_{1} a_{2}+b_{1} b_{2}+c_{1} c_{2}}{\sqrt{a_{1}^{2}+b_{1}^{2}+c_{1}^{2}} \sqrt{a_{2}^{2}+b_{2}^{2}+c_{2}^{2}}}

Let  \theta  be the angle between the given lines

\begin{aligned} &\cos \theta=\frac{3 \times 2+2 \times(-12)+(-6) \times(-3)}{\sqrt{3^{2}+2^{2}+(-6)^{2}} \sqrt{2^{2}+(-12)^{2}+(-3)^{2}}} \\ & \end{aligned}

=\frac{6-24+18}{\sqrt{49} \sqrt{157}}

\begin{aligned} &=0 \\ & \end{aligned}

\theta=\frac{\pi}{2}

Thus, the angle between the given lines is  \frac{\pi}{2}

 

Posted by

infoexpert27

View full answer

Crack CUET with india's "Best Teachers"

  • HD Video Lectures
  • Unlimited Mock Tests
  • Faculty Support
cuet_ads

Similar Questions

Trending Articles/News

anam-khan

PM Modi's Pariksha Pe Charcha 2025 to be held next month, registrations open till January 14
anam-khan

CBSE Board Exams 2025: Online portal for availing exemptions by CWSN students opens
anam-khan

Board Exams: States agree to equivalence; no question paper ‘jumbling’ from next year, says PARAKH CEO

Latest Question