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keliling = 2 (panjang+lebar)
= 2 (195+30)
= 2 x 225
450m
450 : 1,5 = 300
19)
layang layang + trapesium
layang layang = 1/2 x 13,5 x 8 = 54cm²
trapesium = 1/2 (8+12) x 9,5 = 95cm²
54+95= 149