To calculate the radius is very easy, the formula is d/2 where d is diametre.
therefore according to d/2 = 9cm/2
which is equals to 4.5 cm
Result : the radius of a circle with a diameter of 9 cm is 4.5 cm.
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radius = 18/2 = 9 cm
Radius is half the diameter. 18 / 2 = 9 Answer: 9.0 cm
A circle with a radius of 9 inches has a circumference of 56.55 inches and a diameter of 18 inches.
The radius is half of the diameter, so 9 divided by 2 = 4.5 So, 4 and a half yards.
Circumference of a circle = 2*pi*radius or pi*diameter