a circle has radius 3cm. what is the circumference?
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Step-by-Step Solution
Step 1: Recall the formula for circumference
The circumference of a circle, denoted by C, is the distance around the circle. The formula to calculate the circumference is C=2πr, where r is the radius of the circle and π (pi) is a mathematical constant approximately equal to 3.14159.
Step 2: Substitute the given radius
We are given that the radius r of the circle is 3 cm. We substitute this value into the circumference formula.
Step 3: Calculate the circumference
Now, we multiply the numbers together: 2×3=6. So, the circumference of the circle is 6π cm. We leave π in the answer unless a specific numerical approximation is requested.