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package main
import (
"math"
)
func Perimeter(rectangle Rectangle) float64 {
return 2 * (rectangle.Width + rectangle.Height)
}
type Shape interface {
Area() float64
}
type Rectangle struct {
Width float64
Height float64
}
func (r Rectangle) Area() float64 {
return r.Width * r.Height
}
type Circle struct {
Radius float64
}
func (c Circle) Area() float64 {
return math.Pi * c.Radius * c.Radius
}
type Triangle struct {
Base float64
Height float64
}
func (t Triangle) Area() float64 {
return (t.Base * t.Height) * 0.5
}
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