640 square inches-80 cm x 50 cm/around 32 inches x 20 inches
It may not sound like a huge difference because the dimensions themselves aren't hugely different,but considering the difference in actual floor space that is one example of many that big differences don't necessarily have to be as massive as you'd think
450 square inches is 30 inches x 15 inches,so comparing that to 80 cm x 50 cm aka 640 square inches that's only 2 inches longer and 5 inches wider.That size difference gives an additional 90 square inches,however,which is a considerable difference.