P = AB + BC + AC
[tex]ab = \ \: \sqrt{(x2 - x1) ^{2} + {(y2 - y1)}^{2} } [/tex]
[tex]ab = \sqrt{{( - 1 - 3)^{2} } + (4 - 1) ^{2} }[/tex]
[tex]ab = \sqrt{16 + 9} [/tex]
[tex]ab = \sqrt{25} [/tex]
AB = 5
[tex]bc = \sqrt{(3 - - 1)^{2} + {(7 - 4)}^{2} } [/tex]
[tex]bc = \sqrt{16 + 9} [/tex]
[tex]bc = \sqrt{25} [/tex]
BC = 5
[tex]ac = \sqrt{(3 - 3)^{2} + {(7 - 1)}^{2} } [/tex]
[tex]ac = \sqrt{0 + {6}^{2} } [/tex]
[tex]ac = \sqrt{36} [/tex]
AC = 6
P = AB + BC + AC
P = 5 + 5 + 6
P = 16
