package main

import (
    "fmt"
    "math"
)

type Point struct{ X, Y float64 }
type Path []Point

func (p Point) Distance(q Point) float64 {
    return math.Hypot(q.X-p.X, q.Y-p.Y)
}

func (p Path) Distance() float64 {
    sum := 0.0
    for i := range p {
        if i > 0 {
            sum += p[i-1].Distance(p[i])
        }
    }
    return sum
}

func main() {
    perim := Path{
        {1, 1},
        {5, 1},
        {5, 4},
        {1, 1},
    }
    fmt.Println(perim.Distance())
}

# go run main.go 
12

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