LET H BE HEIGHT OF SQUARE TABLE

SQUARE WILL HAVE FOUR SIDES

TABLE HAS SYMMTERICAL STRUCTURE

AREA OF SQUARE = 900 CM^2

AREA OF RECTNGLE FORMED BY HEIGHTS AND ONE SIDE OF SQUARE = H * 3

TOTAL RETCNAGLE = 4 H *3

TOTAL SQUARE = 2 *900= 1800

NOW  TOTAL AREA OF SQUARE = TOTAL AREA OF RECTANGLE  

12H= 1800

H=  125 CM