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12 cards from this deck
Total distance around outside edge of a shape
Add all side lengths together
How much space a shape covers
Square units like cm² or m²
Equal in length
Count squares inside the shape
1 cm²
12\frac{1}{2}21 cm²
Whole ×1\times 1×1 + part ×12\times \frac{1}{2}×21
cm or m
Only 2 side lengths (opposite sides equal)
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