To calculate square feet, multiply the length of the surface by the width. In this instance, 13 x 10 = 130 square feet.
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156 square feet
130 square feet. Multiply length by width - the result is the area in square feet.
19 x 13 = 247 square feet.
13 x 18 = 234 square feet.
Multiply it. 13 feet x 12 feet is 156 square feet