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b. jika dijumlahkan, panjangnya 10 cm dan lebarnya 6 cm
c. K= (2×P) + (2×l)
= (2×5) + (2×3)
= 10 + 6
= 16
hasil perhitungan tadi hanya dikalikan 2 saja. 16 × 2 = 32
L= P×l
= 5×3
= 15
hasil perhitungan luasnya tinggal dikalikan 2. 15 × 2 = 30