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-luas trapesium = 1.350 m
- t = 9
- panjang sisi satunya = 13 m
l trapesium = (jumlah sisi sejajar) x t: 2
1.350 = (13 + a ) x 9 : 2
1.350 x 2 = (13 + a) x 9
2700 : 9 = 13 + a
300 = 13 +a
a = 300-13
= 287