A square has a perimeter of 28 cm. All dimensions are increased by a scale factor of 3 to create a similar figure. What would be the perimeter of the new figure?

Well, if the perimeter is 28, then 28 / 4 = 7 units, is each side of the square. Right? So, if we scale it up by a factor of 3, or 7 x 3 =21 units, the side of the new square. Therefore 21 x 4 = 84 units, the perimeter of the new square.