If A + B = c and A+B ? = c ? then prove that A and B are perpendicular to each
other.
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Answer:
vector a + vector b = vector c
Which means
C^2 = A^2 + B^2 + 2 A B cosx
Where x is the angle between vector a & vector b
But it is given that
A^2+B^2= C^2
Thus
C^2 = C^2 + 2 A B cosx
2A B cosx = 0
A &B are not zero therefore
Cosx = 0
X = 90 degree
Thanks
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