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10 cards from this deck
h2=a2+b2h^2 = a^2 + b^2h2=a2+b2
Longest side, opposite the right angle
Total distance around the outer boundary of a shape
Circumference
P=2(l+b)P = 2(l + b)P=2(l+b)
C=2πrC = 2\pi rC=2πr
Amount of surface enclosed within boundaries of a shape
A=12bhA = \frac{1}{2}bhA=21bh
A=πr2A = \pi r^2A=πr2
Has one pair of parallel sides
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