Solution Review: Advancing the Shapes Analysis

package main
import "fmt"
type Square struct {
	side float32
}
type Triangle struct {
	base   float32
	height float32
}
type AreaInterface interface {
	Area() float32
}
type PeriInterface interface {
	Perimeter() float32
}
func main() {
	var areaIntf AreaInterface
	var periIntf PeriInterface
	sq1 := new(Square)
	sq1.side = 5
	tr1 := new(Triangle)
	tr1.base = 3
	tr1.height = 5
	areaIntf = sq1
	fmt.Printf("The square has area: %f\n", areaIntf.Area())
	periIntf = sq1
	fmt.Printf("The square has perimeter: %f\n", periIntf.Perimeter())
	areaIntf = tr1
	fmt.Printf("The triangle has area: %f\n", areaIntf.Area())
}
func (sq *Square) Area() float32 {
	return sq.side * sq.side
}
func (sq *Square) Perimeter() float32 {
	return 4 * sq.side
}
func (tr *Triangle) Area() float32 {
	return 0.5 * tr.base*tr.height
}