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The diameter is six cm.
radius=1/2 diameter so R=3cm
The diameter of any circle is twice the radius. Since the radius of this circle is 15mm, the diameter is 15mm*2=30mm. 30mm is also 3cm.
The volume of a cylinder that has a radius of 3cm and a height of 7cm is 197.92cm3
A cylinder with a 7cm radius and 3cm height has a total surface area of about 439.82cm2