text: Biggest Square that can be inscribed within an Equilateral triangle | Function to find the side of the square ; the side cannot be negative ; side of the square ; Driver code
code: < ? php function square ( $ a ) { if ( $ a < 0 ) return -1 ; $ x = 0.464 * $ a ; return $ x ; } $ a = 5 ; echo square ( $ a ) ; ? >