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lebar = l
panjang = l + 5
keliling = 2(p+l)
30 = 2(l+5+l)
30= 2(2l+5)
30 = 4l + 10
maka 4l = 30-10=20
maka l=20/4 = 5
maka panjang = l +5 = 5+5 = 10
maka 10 cm adalah panjangnya
dan lebarnya adalah 5 cm
2x = 15 - 5
2x = 10
lebar = x =5
panjang = 5+5 =10