To answer the problem above, use conversion factor and dimensional analysis. Every centimeters is composed of 10 millimeters. Hence, every cm^2 is composed of 100 mm^2. Solving the given,
5600 mm^2 x (1 cm^2/ 100 mm^2) = 56 cm^2.
Thus, the answer is 56 cm^2 which is letter C.
