Hello readers

It does not matter how slowly you go as long as you do not stop.With this thought, let’s continue our discussion on direction Cosines and ratios. I hope you have already gone through the mentioned topic in detail, if not then first refer the following;

https://namitatiwari.org/2020/04/13/direction-cosines-and-direction-ratios/

As much you do practicals, your understanding will improve.

So take your time and solve the following questions

Thank you

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Gud evening….

Mam plz give the solution to check all the questions….

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Ok

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Solution

1.L=1/4,m=0,n=3/4

2.1/3=1/3,2/3=2/3,2/3=2/3 so PQ and RS is a parallel line

3.L=1/√17,m=0,n=4/√17 and k=1/√17

4. angle=cos^-1 √2/3

5.angle=cos-1 90

6.48/169-48/169=0 so it is perpendicular line

6/7=85% done…

Plz check the ans

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Well done Aman…you are genius

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Mam but answer 1 mai l= 0, m= 1/2 and n= √ 3/2 aa raha hai

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Yes.,.Sakshi….u r right…

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mam sirf 7th ni hua baki 6 ke ans bhej dete to confirm kr lete

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Ok Yash..very good

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Good morning mam,plz check the answer****1- 0,1/2,√3/2

3- L=1√17,M=0,n=4/√17

4- cos invers 1/3

5- angle= cos 90

6-. 12/13×4/13+(-3/13)×12/13+(-4/13)×3/13=0

Then 48-48/169=0 it is perpendicular line

Mam snd the solution question no 2&7

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I will upload answers… check…

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Answer no 4 – angle = cos invers √2/3

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Good

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Question no 2 me mam point (-1,-2,1)& (1,2,5) then mam parallel hoge

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Mam I think aman’s first answer is wrong

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Yes…I solved

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Mam questions number 7 ka solution send ker dijiye

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Ok

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ma’am in ques 2 the coordinates of R should be (-1,-2,1) in place of (-1,-2,-1)???

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You are right, I updated it

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ma’am in ques 2 ..the coordinates of R should be (-1,-2,1) in place of (-1,-2,-1) ??

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Yes

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1)l=0,m=1/2,n=√3/2

2)(2,4,4)&(2,4,4)both are same therefore they are parallel

3)a=1,b=0,c=4

4)cos^-1(√2/√3)

5)angle=90

6)48/169-48/169=0 hence angle Will be 90

7)first line=–1/√6, 1/√6, 2/√6

Second line=1/√14, 2/√14, 3/√14

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Excellent

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1)l=0,m=1/2,n=√3/2

2)(2,4,4)&(2,4,4)both are same therefore they are parallel

3)a=1,b=0,c=4

4)cos^-1(√2/√3)

5)angle=90

6)48/169-48/169=0 hence angle Will be 90

7)first line=–1/√6, 1/√6, 2/√6

Second line=1/√14, 2/√14, 3/√14

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Excellent Pranjul…in question no 2 there is a correction…I updated it, please check

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mam can you please provide previous year questions for practice related to the topics as not having question bank.

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Thank you Ma’am

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Mam in question number 7 m/n ki two value Aa rahi hai

2/3 and 1/2

Mam dono se direction cosine nikal na hoga

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Yes

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Two different lines with different direction Cosines

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Mam I have done all questions.

Thanks mam…

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Well done Shivani

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Ques:- 7

DCs for one line are ( -1/√6,1/√6,2/√6 )

DCs for other line are

( 1/√14,2/√14,3/√14 )

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Ques:-7

DCs for one line are ( -1/√6,1/√6,2/√6 )

DCs for other line are

( 1/√14,2/√14,3/√14 )

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Yes…very good

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mam I completed 6 questions. ..above 80%

please provide solutions so to check the ans.

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Ok

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