If the radius of a circle is 4 cm what is the circumference

To start, since you know the radius of a circle is half of the diameter, and the formula for the circumference of a circle is C=Dπ (d is diameter) or C=2πr, you would first find the diameter of the circle which is 8 (you find this by multiplying the radius by 2). Then, if you multiply the diameter by π or if you want to round, use 3.14. This would result in 8π or 25.12 cm as your circumference. (hope this helps XD)

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The correct answer is clerk, i did the quiz