Find if a point lies inside a Circle | PHP program to check if a point lies inside a circle or not ; Compare radius of circle with distance of its center from given point ; Driver Code
< ? php function isInside ( $ circle_x , $ circle_y , $ rad , $ x , $ y ) { if ( ( $ x - $ circle_x ) * ( $ x - $ circle_x ) + ( $ y - $ circle_y ) * ( $ y - $ circle_y ) <= $ rad * $ rad ) return true ; else return false ; } $ x = 1 ; $ y = 1 ; $ circle_x = 0 ; $ circle_y = 1 ; $ rad = 2 ; if ( isInside ( $ circle_x , $ circle_y , $ rad , $ x , $ y ) ) echo " Inside " ; else echo " Outside " ; ? >