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The circumference of a circle is always Pai times the diameter
Circumference of circle = diameter * pi
So it's right
The ratio of perimeter to area of the same circle is 2: π
Circumference of circle = π * 2 * radius
Area = square of π * radius
So the ratio is 2: π * radius
The circumference of a circle is 2 π times its radius______ (judge right or wrong)
The circumference of a circle is 2 π times its radius
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