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10 cards from this deck
2 angles equal → triangles similar
Are proportional
Create proportional segments
Line || side → divides other sides proportionally
Cross-multiply: ad=bcad = bcad=bc
AA Similarity Theorem
Corresponding sides
y=10.5y = 10.5y=10.5
x=9x = 9x=9
Same shape, angles equal, sides proportional
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