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= 2x 12
= 24 cm
2. K = 2x (10+8) L= 10x6 = 60 cm²
= 2 x 18
= 36 m
3. AB = (30-24) : 2 = 3 cm L= 3 x 8 = 24 cm²
4. BC = (40-28) : 2 = 6 cm L= 14x 10 = 140 cm²
5. AB = 120 : 20 = 6cm
BC = (80 - 12) :2 = 68 : 2 = 34 cm