javascript program to check if one circle lies inside another circle or not .
function circle ( x1 , y1 , x2 , y2 , r1 , r2 ) { var distSq = parseInt ( Math . sqrt ( ( ( x1 - x2 ) * ( x1 - x2 ) ) + ( ( y1 - y2 ) * ( y1 - y2 ) ) ) ) ; if ( distSq + r2 == r1 ) { document . write ( " " + " " + " " + " " ) ; } else if ( distSq + r2 < r1 ) { document . write ( " " + " " + " " + " " ) ; } else { document . write ( " " + " " ) ; } }