Answers

2014-10-26T16:48:57+05:30
Since
ab=ac=ad
then
angB=angACB=angACD=angD=X
WE KNOW THAT IN TRIANGLE PBC
X+2X+X=180
4X=180
X=45
THEREFORE
angc=x+x=2x=x*45=90
hence proved

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2014-10-26T18:49:27+05:30
Given ab=ac=ad AngleB=angleACB=angleACD=angleD=X In triangle PBC X+2X+X=180 4X=180 X=45 Therfore angleC=X+X=2x=x*45=90 Proved
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