9th question please.. 9th question please.. the O' the side. BA and DC of a quadrilateral • • • LC • _ ofa quadrilateral) MO • •it.hin quadrilateral ABCD, prove that : 0B OD BD. [Hint : W. that •um any two sides eda > BD.I IOUS TYPES OF S Share with your friends Share 0 Neha Sethi answered this Dear student Join AC.Since ∠ACF is an exterior angle of a △ADC,then∠ACF=∠ADC+∠DAC [Exterior angle theorem]⇒∠ACB+∠BCF=∠ADC+∠DAC⇒∠ACB+a=y+∠DAC ...(1)Since ∠EAC is an exterior angle of a △ABC,then∠EAC=∠ABC+∠BCA [Exterior angle theorem]⇒∠EAD+∠DAC=∠ABC+∠ACB⇒b+∠DAC=x+∠ACB ...(2)Adding (1) and (2), we get∠ACB+a+b+∠DAC=y+∠DAC+x+∠ACB⇒x+y=a+b Regards 1 View Full Answer Rincy Deepika answered this Hope it helps! 1 Meena Yadav answered this Thanks a lot... 0
