Answer:
okay so, i had a problem like this one and hated it, so ill try to help you out here
Explanation:
If it is 81 all together it is safe to say the length and width is nine, making one mat six by 3, the little square being 3 by 3,
so the area of one mat would be six times three = 18
and if the width is 3, the length would be 6, unless it is cut in half, which we can assume it is not.
I hope this helps!