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Observe the figures, The corresponding angles are equal measures, $\"\"$ .

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The lengths of the corresponding sides are proportional.

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The corresponding sides of similar triangles are proportional $\"\"$ .

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$\"\"$ (Substitute a = 18, c = 9, f = 6)

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$\"\"$ (Apply cross product: $\"\"$ )

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$\"\"$ (Multiply: $\"\"$ ) $\"\"$

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Apply division property of addition: If a = b then $\"\"$ .

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$\"\"$ (Divide each side by 9)

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$\"\"$ (Cancel common terms)

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$\"\"$ (Divide: $\"\"$ ) $\"\"$

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The corresponding sides of similar triangles are proportional $\"\"$ .

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$\"\"$ (Substitute a = 18, d = 12, e = 10)

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$\"\"$ (Apply cross product: $\"\"$ )

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$\"\"$ (Multiply: $\"\"$ ) $\"\"$

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Apply division property of addition: If a = b then $\"\"$ .

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$\"\"$ (Divide each side by 12)

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$\"\"$ (Cancel common terms)

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$\"\"$ (Divide: $\"\"$ ) $\"\"$

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The missing measures are 12 and 15.