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Question Number 60948 by Kunal12588 last updated on 27/May/19
Commented by Prithwish sen last updated on 27/May/19
LetAbetheoriginofthecomplexplaneand,AB=2aBC=2bCD=2cAD=2d,wherea,b,c,d∈C(complexnumber)∵ABCDisaquadrilateralthen,a+b+c+d=0Now,P=a+iaQ=2a+(1+i)bR=2a+2b+(1+i)cS=2a+2b+2c+(1+i)dNowletthecomplexnumber,z1=S−Q=(b+2c+d)+i(d−b)z2=R−P=(a+2b+c)+i(c−a)Nowz1+iz2=(b+2c+d−c+a)+i(d−b+a+2b+c)=(a+b+c+d)+i(a+b+c+d)=0i.ez1⊥z2or,PR⊥SQProved.
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