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L2= 12 x 18 = 216
= 216 + 216 = 432 cm²
2. L1 = 18 x 20 = 360: 2= 180
L2= 20x 11 = 220
= 180 + 220 = 400cm²
3. maaf no. 3 dan 4 nya gak bisa
5. L1 =4+2 =6 x 2,5 =15
L2= 5 x 6= 30 : 2= 15
= 15 + 15 = 30