A rectangular garden 50 feet long and 10 feet wide is enclosed by a fence. To make the garden larger, while using the same fence, its shape is changed to a square. By how many squa

Square feet of rectangle = 50 x 10 = 500 square feet.

The perimeter of the rectangle is 50 + 50 + 10 + 10 = 120 feet.

Change to a square: 120/4 = 30

The square would have a side length of 30 feet.

Area of the square = 30 x 30 = 900 square feet.

The square is 900. - 500 = 400 square feet more.