If you're talking about the radius being 24 cm, then the the circumference is exactly 48 PI.
If the diameter is 24 cm, then the circumference is 24 PI
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circumference = 2πr = 2π x 6 = 12π units
Oh, dude, you just gotta take the diameter and multiply it by π (pi), which is approximately 3.14. So, the circumference would be 24 cm x 3.14, which equals 75.36 cm. Easy peasy, right? Like, who needs a calculator for that?
12 cm
circumference formula is pi(diameter) diameter is 2(radius) radis=4; diameter=2(4)=8 pi(8)=circumference of the circle...this is the EXACT answer plug it into a calculator and you will get 25.1327412287 your welcome ;)
My understanding is that as the measurement of the circumference of a circle is derived from an equation using "pi" with pi being an indefinite number, the measurement of the circumference of a circle is also an indefinite number, but the figure can be rounded back to a predetermined number of decimal places.