A 243 calibre rifle is Just that. The bore (internal measurement of the barrel) is 0.243 of an inch in diameter.
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If a circle has a diameter of 24 inches its circumference is: 75.4 inches (diameter x Pi = circumference).
17 micrometers = .00066929133858267 inches.
Circumference = 7.5 inches implies that diameter = 2.387 inches
The area of a circle with a diameter of 16 inches is: 201.1 square inches.
The circumference of a cirlce that has a diameter of 3 inches would be about 9.42 inches