yes the radius is half the diameter. It goes from the edge of the circle to the centre.
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The circumference of a circle with radius of 6 is about 37.7
16 cm
The area of a cirle is: PI * r2 Where "r" is the radius, and PI is approximately 3.14. Hint: A radius is half of the diameter.
Diameter, cord, radious.
About 408.41 inches.