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Link grafik:
http://www.wolframalpha.com/input/?i=+plot+x%2By%3D1%2Cx%2By%3D+-1%2Cx-y%3D+1%2C+x-y%3D+-1
x=0,y=1 x=0, y=-1 x=0, y=-1 x=0,y=1
y=0,x=1 y=0, x=-1 y=0, x=1 y=0,x=-1
bentuk bangun dari keempat gmbar tsb adalah belah ketuat