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10 cards from this deck
Total length of outside boundary of a shape
The perimeter of a circle
P=2×length+2×widthP = 2 \times \text{length} + 2 \times \text{width}P=2×length+2×width
P=4×lengthP = 4 \times \text{length}P=4×length
C=π×diameterC = \pi \times \text{diameter}C=π×diameter
Line from centre to edge of circle
Line edge to edge through centre; d=2rd = 2rd=2r
3.1423.1423.142
String around circle, then measure string with ruler
mm, cm, m, or km
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