Well, if you know the diameter of the circle already, then you can divide it by half to get the radius.
If you don't have the diameter however, then you simply have to find the middle of the circle and measure from the middle of the circle to the edge. That would be your radius.
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The radius (not raduis) is 1.25 cm.
the diameter of a circle is from one side of the circle to the other, and the raduis is always half, because the raduis is from the side to the middle, so the answer is 18
A radius (not raduis) of 15 units implies a circumference of 94 units.
Divide the circumference by 2pi
Circumference = 2*pi*radius (not raduis) = 19 cm, approx.