Objective: I know how to calculate the circumference of a circle.

The circumference of a circle is the distance around the circle.

The formula is π*d* or 2π*r*

Read the lesson on circumference of circle if you need to learn how to calculate the circumference of a circle.

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!

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