A radius (not raduis) of 15 units implies a circumference of 94 units.
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Circumference = 2*pi*radius (not raduis) = 19 cm, approx.
Divide the circumference by 2pi
Radius = circumference/pi
Circumference of a circle: 2 x pi x radius.
to find the raduis of any circle, divde the diameter by 2. in this case, the answer would be 3.50