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Luas persegi panjang tidak asir = =180 -60 =120
Luas trapesium = 1/2 x 12 x (20+15) = 6 x 35 =210
Luas trapesium tdk diasir = 210 - 60 =150
Luas daerah tidak diasir = 120 + 150 = 270 (jawaban C)