數學問題......

Each side of a square is equal, as the perimeter is 240cm, thus each side of the square is 240/4 = 60cm

So, the areal of the square is 60 x 60 = 3600cm2

For general, the area is A = ( P/4 ) X ( P/4 ) cm2
where 'A' is the area of the square, and P is the perimeter of the square.

a square of perimeter 240 cm
=> the length of each side = 240 / 4 = 60 cm

so the area of the square = 60 X 60 = 3600 cm^2