Problem

Identify \(\text{every}~\text{card}\) that describes circumference rather than perimeter.

Cards:
• The distance around a bicycle tire
• \(2\pi~r\)
• The total distance around a rectangular picture frame
• \(\pi~d\)
• A hexagon with side lengths added together
• The boundary of a circular pond
• \(2l~+~2w\)
• The amount of fencing needed to go once around a circular dog run

Answer choices

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The distance around a bicycle tire; 2πr; πd; The boundary of a circular pond; The amount of fencing needed to go once around a circular dog run

The total distance around a rectangular picture frame; A hexagon with side lengths added together; 2l + 2w

The distance around a bicycle tire; 2πr; The total distance around a rectangular picture frame; πd; The boundary of a circular pond; The amount of fencing needed to go once around a circular dog run

2πr; πd

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