No, only if the diameter is bigger than the radius is the radius smaller than the diameter.
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The radius of a circle is always 1/2 its diameter.
Length of a radius is always half the diameter of a circle. This means that the circle has a radius of 2cm.
The radius is always half the diameter, so the answer is 6.
The diameter is always double the radius so in this case, it is 18cm
Pi - the circumference of a circle over the diameter of a circle. Pi is constant and will always be 3.14. Radius - any line segment in a circle that extends from the center of the circle to the perimeter of the circle. Radius is half the diameter.