15 square cm. Since every square is 1 square cm, every half box should also be halved, which is 0.5 square cm. Now when u count the toal number of squares and half squares, you should get 12 squares and 6 halved squares. That will give you the value of 15 square cm. Here's a tip: Always count thr number of whole squares first, before counting the number of halved squares. Hope this helps ;)
