or 10 cm x 20 cm = 3.937 inches x 7.874 inches
How many inches is 10 x 20 cm? The answer to this question is 10 x 20 cm is equal to 78.7401 inches. If you want to calculate the area, then the answer is 10 cm x 20 cm equals 3.937 inches x 7.874 inches, and the final calculated area is 30.999938 square inches.