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10 cards from this deck
Parallel to the third side
Similar triangles
Square of the ratio of corresponding sides
A1A2=(s1s2)2\frac{A_1}{A_2} = \left(\frac{s_1}{s_2}\right)^2A2A1=(s2s1)2
Heights
Quadratically
Parallel
49\frac{4}{9}94 (square the simplified ratio)
Proportional division → parallel to 3rd side
Area depends on base & height, both proportional
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