If what I’m imagining is correct, the you have a rectangle with two of the sides being the same length they were when it was a square. But the other two are half as much as the original. Because there are two half’s you can add them to make one whole (one original side length). Divide 21 by 3 to find out the side length, because it’s a square they’re all going to be the same. Now you know that the length off all the sides of the square are 7. To find the area just multiply length times width (7x7), and get 49 square inches as the answer
