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keliling = 2.(p + l)
30 = 2.(5 + l + l) ----kedua ruas bagi dengan 2
15 = 5 + 2l
2l = 15 - 5
2l = 10
l = 10/2
l = 5
Dit: l???
jb: K = 2 (p + l)
30 = 2 (5l + l)
30 = 2 (6l)
30 = 12l
12l = 30
l = 2,5 cm
Sekian....................