Driver code
$ a = 6 ; echo ( " Area ▁ of ▁ inscribed ▁ circle ▁ is ▁ : " ) ; echo ( area_inscribed ( $ a ) ) ; echo ( " Perimeter ▁ of ▁ inscribed ▁ circle ▁ is ▁ : " ) ; echo ( perm_inscribed ( $ a ) ) ; ? >