A 2-inch diameter is roughly the size of a standard Baseball, which measures about 9 inches in circumference. To visualize it, imagine a small round object, like a coffee mug's handle or a large cookie. It's about the width of a typical adult's thumb. This size can fit comfortably in the palm of your hand.
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It is the equivalent of 1.66 centimeters which is just over 1/2 an inch
Bottle caps are about 2 cm in diameter.
A 2-inch diameter sphere has a volume of 4.189 cubic inchesA 1-inch diameter sphere has a volume of 0.5236 cubic inches.
16 inch circumference: radius = diameter / 2. diameter = circumference/pi, so radius = 16 in / 2 / pi = (8/pi) inches [approx 2.55 inches] 16 inch diameter: radius = diameter / 2 = 16 in / 2 = 8 inches.
If 27 inches is the diameter, then that is the diameter. If 27 inches refers to the radius, you must multiply it by 2 to get the diameter.