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(14×20):2 × 15 =280 :2 × 15 =140 ×15 =2.100
luas p.panjang
p × t= 10 × 18 = 180
180 + 2.100 =2.280 - 150 = 2. 130
jadi daerah yg tidal diarsir 2.130
maaf kalo salah