the resultant of two vectors P + q and P - Q when they are at right angles to each other is
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r^2 = p^2 +q^2 (Since the angle is 90°)
r^2 = (p+q)^2 + (p-q)^2
= p^2 + 2pq +q^2 + p^2 - 2pq +q^2
= 2p^2 + 2q^2
r = √2(p^2 +q^2)
r^2 = (p+q)^2 + (p-q)^2
= p^2 + 2pq +q^2 + p^2 - 2pq +q^2
= 2p^2 + 2q^2
r = √2(p^2 +q^2)
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