Mon September 09, 2013 By: Deepika Babbar

OB is perpendicular bisector of line segment DE, FA perpendicular OB and FE intersect OB at C. to prove : 1/OA+ 1/OB= 2/OC

Expert Reply
Vimala Ramamurthy
Tue September 10, 2013
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Sun July 02, 2017

please ans question no. 9

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