Question

if a vector b vector and c vector an 3,4,5 units respectively find all angles

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Answer 1

Let
x
ˉ
=30 units
B
ˉ
=44 unit
c
ˉ
=5 units
A+B=C
′
squaring m both side
(A+B)
2
=C
2
=1
A
2
+B
2
+2ABcosθ=C
2

3
2
+4
2
+2×3×4cosθ=5
2

24cosθ=25−25
cosθ=0/2
cosθ=0
θ=cos
−1
(0)=90
o
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