Driver Code
$ side = 4 ; echo ( " Area ▁ of ▁ Equilateral ▁ Triangle : ▁ " ) ; echo ( area_equi_triangle ( $ side ) ) ; echo ( " STRNEWLINE " ) ; echo ( " Perimeter ▁ of ▁ Equilateral ▁ Triangle : ▁ " ) ; echo ( peri_equi_triangle ( $ side ) ) ; ? >