18500 square inches
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That depends on the size of the notebook, and the paper in it.
-- If the paper is US "standard" size of 8.5" x 11", then each sheet has 93.5 square inches
on one side, and 100 sheets have 18,700 square inches on both sides.
-- I'm holding a spiral bound notebook in my hand right now. Each sheet is lightly
perforated, so that it can be torn out of the spiral with a clean edge, leaving the
fringes still attached to the spiral.
The clean, tear-out area of a sheet measures 71/2" x 103/8". The area of each side is
77.8125 square inches, and 100 sheets have 15,562.5 square inches on both sides.
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11 Inches
The thickness of 30,000 pieces of paper depends on the thickness of a single sheet. A standard sheet of office paper is typically about 0.004 inches thick. To calculate the total thickness: 30,000 \times 0.004 \text{ inches} = 120 \text{ inches} So, 30,000 pieces of standard office paper would be approximately 120 inches thick.
If the paper is in inches then 11 times 14 = 154 square inches
105 square inches is:6.774 square decimeters677.4 square centimeters0.06774 square meters0.7292 square feetAbout the area of letter paper (93.5 square inches)
192 square inches!