1.8 cm
The radius is half of the diameter.
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It's 18 cm. The radius is half the diameter of a circle. Half 36 cm is 18 cm.
It is 18 centimeters because your radius is exactly half of the diameter in any circle
it is half the diameter e.g 10cm diameter = 5 cm radius
Diameter = 12 cm so radius = 6 cm. Then area = pi*r2 = 36*pi = 113.1 cm2
The radius is always exactly half of the diameter, so if the radius is 8 cm, then the diameter is 16 cm.