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67200 - [ 2x(2800+1200)/50] = ....
a.luas tanah= pxl=28x12=336 m
kan jarak antar pohon adalah 50m,jd 336:50 m= 6 pohon
b.keliling tanah=2xp+l=2x28x12=672m-1m=671m;50=11 pohon lebih tanah 21m