If the piont (A,B),(A\',B\'),(A-A\',B-B\') are collner then prove that AB\'=A\'B

If the piont (A,B),(A\',B\'),(A-A\',B-B\') are collner then prove that

1.	If the piont (A,B),(A\',B\'),(A-A\',B-B\') are collner then prove that AB\'=A\'B
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