Answer: 80 cm ^2
Explanation:
Largest square = 11 by 11
Smallest square = 8 by 8
Side of triangle =
a^2 + b^2 = c^2
you can only use this formula for right angled triangles. it's called the pythagorean theory
in this case you are looking for a^2
a^2 + 8^2 = 11^2
a^2 + 64 = 144
a^2 = 144 - 64
a^2 = 80
in this case. the number isn't going to be friendly.
a = 8.9443
a is just that one side of that triangle though.
but in the end
Area of medium square = 80
because
8.9443 x 8.9443 = 80