If ab parallel pq parallel CD ,ab=x units ,CD=y units,and pq=z units ,

1.	If ab parallel pq parallel CD ,ab=x units ,CD=y units,and pq=z units ,prove 1/x +1/y =1/z
Answer» In [common angle] [Each 90o] [AA criteria]Then, ....(i)Similarly, ...(ii)On adding Eq(i) and Eq(ii), we get\xa0

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