CBSE Class 12-science Answered
ax b = c x d ...(1)
a x c= b x d...(2)
subtracting (1) from(2),
a x (b-c) =( c-b) x d
a x (b-c) +( b-c) x d=0
a x (b-c) - d x ( b-c) =0
(a-d) x (b-c)=0
Hence,|a-d|=0 or |b-c|=0
or (a-d) is parallel to (b-c).
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