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BC=√(2-2)²+(3-2)²=1
AC=√(3-3)²+(2+6)²+√36=6
Ob=1+36+√61= 37+√61
b) DE=√(4+2)²+(-2+2)²=√36=6
EF=√(1-4)²+(4+2)²=√9+36=√45=3√5
DF=√(1+2)²+(4+2)²=√9+36=3√5
Ob=6+3√5+3√5=6+6√5
c) GH=√(4+4)²+(-1+1)²=8
HI=√(-1-4)²+(3+1)²=√25+16=√41
GI=√(-1+4)²+(3+1)²=√9+16=5
Ob=8+5+√41=13+√41