You see you can do is 72cm divide by 3 because an equilateral triangle has 3 sides 72cm/3 = 24cm
(I am not sure if this is right)
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3.897 square inches.
Suppose the side of the square is x cm.Then its perimeter is 4x cm.The perimeter of the square is 3 cm more than that of the triangleso the perimeter of the triangle is 4x - 3 cm.Also, if the side of the square is x cm, the side of the triangle must be x + 112 cm.Then its perimeter must be 3*(x + 112) = 3x = 336 cm.Equating the two expressions for the perimeter of the triangle,4x - 3 = 3x + 336therefore x = 339 cm.The square has sides of 339 cm and a perimeter of 1356 cm.The triangle has sides of 451 cm and a perimeter of 1353 cm.
Let x be the side of the triangle. Thus 4(x-5) is the perimeter of the square.Balance by the perimeter relation,3x = 7+4(x-5)Solve for x,x = 13 inches
Area of equilateral triangle: 0.5*12*12*sin(60 degrees) = 187 square cm
Area of equilateral triangle: 0.5*8*8*sin(60 degrees) = 27.7 square inches rounded