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Verified answer
DE / BC = AD / AB9 cm / 6 cm = AD / 4 cm
AD = 9 cm x 4 cm : 6 cm
AD = 6 cm
AB / DE = AC / CD
AB / 10 cm = 9 cm / 6 cm
AB = 10 cm x 9 cm : 6 cm
AB = 15 cm