For square and rectangular glass, 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 glass. Use the tape measure to measure the
length and the width of the glass in inches. Next, multiply the two
measurements of the glass. Divide the answer by 144. This will give you the
square footage of the glass.
To determine the square footage of a
round glass, measure the diameter of the glass using the tape measure (the
diameter is the length across the glass 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 glass with a radius of 3 feet 9 inches has
a decimal radius of 3.75 feet).
Now, calculate the area of the glass
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 glass 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 glass can be calculated by thinking of the glass as a
rectangle with half of a round glass on each end. Do the calculations for
the rectangle and round parts and add them together.
