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|AB|=√(x₂-x₁)²+(y₂-y₁)²
|AB|=√(5+3)²+(-2-0)²=√64+4=√68=√4*17=2√17
|BC|=√(x₂-x₁)²+(y₂-y₁)²
|BC|=√(1-5)²+(4+2)²=√16+64=√80=√5*16=4√5
|AC|=√(x₂-x₁)²+(y₂-y₁)²
|AC|=√(1+3)²+(4-0)²=√16+16=√32=√16*2=4√2
L=2√17+4√5+4√2=2(√17+2√5+2√2)