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by ruplun » Fri Mar 09, 2012 8:35 am
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by pemdas » Sat Mar 10, 2012 2:15 pm
IOM e
st(1) implies angle ABC=angle CAD (let's denote this as 'a') Insuff
st(2) provides only angle ADC=70` Insuff
combining we know ADC=CAD=70` and ACD=180-140=40`. Then CAB+BCA=180-70=110`. From the latter angle BAD could be anything from 70+ to 180- Insuff
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