Circumference = 2*pi*radius (not raduis) = 19 cm, approx.
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Circumference of the circle: 0.18*pi = 0.565 cm rounded to 3 decimal places
circumference = pi*4.4 = 13.823 cm to 3 dp
About 18.85cm
circumference = 2pi50 = 314.159 cm to 3 decimal places
circumference = pi*22.5 = 70.686 cm rounded to 3 dp