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12" x 12" = 1 square foot, so you need 452 of them.
To find the first partial product of 76 times 42, you would multiply the ones digit of 76 (6) by the ones digit of 42 (2), which equals 12. This gives you the first digit of the final product. The 1 is written in the ones place, and the 2 is carried over to the tens place.
12.7156
Area of a circle = pi*r2 Area = pi(12 in)2 ( 144 * pi ) = 452 in2 =======
0.0271