How many square centimeters are in an area of 10.4 in2?

1 inch = 2.54 centimeters

(1 in x 1 in) = 1 in2 = (2.54 cm x 2.54 cm) = 6.4516 cm2

10.4 in2 = (10.4 x 6.4516) = 67.09664 cm2