It's 18 cm. The radius is half the diameter of a circle. Half 36 cm is 18 cm.
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The radius of a circle with a circumference of 36cm is: 5.729 cm
The diameter of a circle is twice its radius
The radius of a circle is half the diameter so if the radius of a circle is r, then the diameter is 2r.
The diameter of a circle is twice its radius
The radius of a circle is always half of the diameter. If the diameter is 85.4, the radius is 42.7.