To find the area of a twelve inch by eighteen inch item, you would simply multiply them together. As follows...
12 in. • 18 in. = 216 inches squared!
So, simply, the answer is 216 inches squared!
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The area of a 14-inch circle is: 153.9 square inches.
A 10.5-inch circle has an area of 86.59 square inches.
The area of a 5-inch circle is: 19.6 square inches.The area of a 4-inch circle is: 12.6 square inches.The area of the 5-inch circle is 55.6% larger than the 4-inch circle
The area of 3.5-inch diameter circle is: 9.621 square inches.
The area of a 18-inch diameter circle is: 254.5 square inches.