Answers

2014-06-10T14:01:29+05:30
Marking this points as A(12,9),B(20,-6),C(5,-14),D(-3,1)
Finding the distance between the points:
AB=(20-12)+(-6-9)=(-8)+(-15)=-23
BC=(5-20)+{-14-(-6}=(-15)+(-8)=-23
CD=(-3-5)+{1-(-14)}=(-8)+(-15)=-23
AD=(-3-12)+(1-9)=(-15)+(-8)=-23
Hence,proved that this points taken in order to form square.
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