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Oh, what a happy little question! If the radius of a circle is 5.5cm, we can find the diameter by multiplying the radius by 2. So, the diameter of this circle would be 11cm. Just a simple little calculation to bring a smile to your face!
A circumference of 34.6 cm
The radius of a circle is half of its diameter
1/2 of the diameter
The diameter of a circle is twice its radius. Thus the radius of a circle is half its diameter. → a circle with a diameter of 15 cm has a radius of 15/2 cm = 7.5 cm