Question

(A) If a =j+ 13k, b=-j+ 13k and © = 213k form a triangle,
then the internal angle of the triangle between ã and 5 is
b​

Answer 1

Answer:

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Step-by-step explanation:

We have, ∣

a

∣=

1

2

+2

2

+2

2

=3, ∣

b

∣=5

Thus area of triangle formed by given vectors =

2

1

∣

a

×

b

∣=

2

1

∣

a

∣∣

b

∣sin

6

π

=

2

1

⋅3⋅5⋅

2

1

=

4

15