vectors

[trail gorge]

I'm not sure how I'm supposed to do this

[vale copper]

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[ionic scroll]

do you know parallelogram law of vectors?

[trail gorge]

no

is it to do with this?

[ionic scroll]

yes

the addition of two vectors is diagonal of parallelogram

so how are you going to apply here?

[trail gorge]

im not entirely sure

[ionic scroll]

$\hat a ,\hat b$ are unit vectors right?

[covert geyser]

pratham

[ionic scroll]

their magnitude is 1

what do you comment on $\hat a+\hat b$?

[covert geyser]

pratham

[trail gorge]

its double the height of the triangle? idk 😭

[ionic scroll]

two adjacent sides of that parallelogram are of length '1'

the figure is now a rhombus and diagonal clearly bisects OA' and OB'

thats what we wanted to prove.....

[trail gorge]

okay

[ionic scroll]

wait it seems lil strange

[topaz dagger]

But that's only when |a| = |b|.

[ionic scroll]

they r unit vectors

[topaz dagger]

Oh. I can't quite see where it's said in the statement of the problem, though...

[ionic scroll]

its given a cap +b cap
cap is unit vector right?

[topaz dagger]

Oh, I'm not aware of such notation.

For a vector u I would denote the unit vectir by e_u.

[trail gorge]

yes

thats how I was taught