Answer:

 

Perimeter = 30

 

AB = √((1-1)2 + (4 - -1) 2)  BC = √((1-13) 2+(-1-1) 2)   AC = √((1 - 13) 2 + (4- -1) 2)

       = √(0 + 25)                             = √(144 + 0)                       = √(144 + 25)

       = √25                                      = √144                                = √169

       = 5                                          = 12                                      =  13

 

Perimeter = 5 + 12 + 13

 

Perimeter = 30