Physics, asked by garuda60, 2 months ago

a=3i+4j+5k, b=I-j-2k, c=2i-3j-3kthen a+b+c=​

Answers

Answered by suhanchauhan50
3

Answer:

Let OA=2i+4j−k,OB=4i+5j+k

and Oc=3i+6j−3k

Now, AB=OB−OA=2i+j+2k

∴AB=∣2i+j+2k∣=

4+1+4

=

9

=3

BC=OC−OB=−i+j−4k

∴BC=∣−i+j−4k∣=

1+1+16

=

18

=3

2

and CA=OA−OC=−i−2j+2k

∴CA=∣−i−2j+2k∣=

1+4+4

=

9

=3

Now, BC

2

=AB

2

+CA

2

(by Pythagoras theorem)

⇒(3

2

)

2

=(3)

2

+(3)

2

⇒18=18

So, triangle is isosceles right angled triangle.

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