If $a x b = c x d$ and $a x c = b x d,$ show that $a - d$ is parallel to $b - c,$ where $a \neq = d$ and $b \neq = \cdot$

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a x b = c x d

and

a x c = b x d,

show that

a - d

is parallel to

b - c,

where

a \neq = d

and

b \neq = \cdot

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Question Text

a x b = c x d

and

a x c = b x d,

show that

a - d

is parallel to

b - c,

where

a \neq = d

and

b \neq = \cdot

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