Program to calculate area and volume of a Tetrahedron | Utility Function ; Driver Code
< ? php function area_of_tetrahedron ( $ side ) { return ( sqrt ( 3 ) * ( $ side * $ side ) ) ; } $ side = 3 ; echo " Area ▁ of ▁ Tetrahedron ▁ = ▁ " , area_of_tetrahedron ( $ side ) ; ? >