The circumference of a circle with a radius of 5cm is: 31.42 cm
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Radius of a circle= Perimeter of the circle/2*pi Radius is half the diameter Radius is the length of a straight line from the center point of the circle to the edge of the circle.
the circumfrence of a circle is pi times it's radius squared.
4 x 5cm = 20cm
34cm
16 cm 5cm+5cm+3cm+3cm=16cm