Check if a given circle lies completely inside the ring formed by two concentric circles | Function to check if circle lies in the ring ; distance between center of circle center of concentric circles ( origin ) using Pythagoras theorem ; Condition to check if circle is strictly inside the ring ; Both circle with radius ' r ' and ' R ' have center ( 0 , 0 )
function checkcircle ( r , R , r1 , x1 , y1 ) { let dis = Math . sqrt ( x1 * x1 + y1 * y1 ) ; return ( dis - r1 >= R && dis + r1 <= r ) ; } let r = 8 , R = 4 , r1 = 2 , x1 = 6 , y1 = 0 ; if ( checkcircle ( r , R , r1 , x1 , y1 ) ) document . write ( " " ) ; else document . write ( " " ) ;