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Verified answer
AB = 12 cmCD = 28 cm
AK = 2/3 AD
KL = AK x CD + DK x AB / AK + DK
= 2 x 28 cm + 1 x 12 cm / 2 + 1
= 56 cm + 12 cm / 3
= 68 cm / 3
= 22,67 cm