For square and rectangular tables, square footage is determined by multiplying the width x the length of the table and dividing the answer by 144. You will need two measurements of the table. Use the tape measure to measure the length and the width of the table in inches. Next, multiply the two measurements of the table. Divide the answer by 144. This will give you the square footage of the table.

To determine the square footage of a round table, measure the diameter of the table using the tape measure (the diameter is the length across the table directly through the center). Divide the diameter in half. The resulting number is the "radius". Convert the radius measurement to decimal by dividing the inches portion of the measurement by 12 (for example, a table with a radius of 3 feet 9 inches has a decimal radius of 3.75 feet).

Now, calculate the area of the table using the formula for the area of a circle: Area equals pi times the radius squared. Pi is a constant value of 3.1416. To square is to multiply by the number by itself. In the example, the round-table calculation will be 3.1416 x 3.75 x 3.75 equals 44.18 square feet, rounded to two places.

The area of an oval table can be calculated by thinking of the table as a rectangle with half of a round table on each end. Do the calculations for the rectangle and round parts and add them together.

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