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10 cards from this deck
12×base×height\frac{1}{2} \times \text{base} \times \text{height}21×base×height
Proportional to their bases
Equal in area
Lie between parallel lines
Line || to side divides other sides in same proportion
AEEC\frac{AE}{EC}ECAE
Parallel to third side
Half the third side
Line from midpoint || to side bisects third side
base 1base 2\frac{\text{base 1}}{\text{base 2}}base 2base 1
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