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kita misalkan lebar = l
dan panjang = (15+l)
keliling p.panjang
2(l) + 2(15+l) = 86
lebar = l
panjang = l +15
keliling = 2(p+l)
86 = 2(l+15+l)
86 = 2(2l+15)
86 = 4l +30
4l=86-30 = 56
l=56/4 = 14
maka lebar = l = 14 m
panjang = l+15 = 14+15 = 29 m