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Keliling = 16 cm + 16 cm + 28 cm + 28 cm
Keliling = 88 cm
b. Luas = a × t
Luas = 11 cm × 28 cm
Luas = 308 cm²
c. Panjang NP = 11 cm
16 cm × 18 cm = 18 cm × NP
308 cm² = 18 cm × NP
NP = 308 ÷ 18 cm
NP = 11 cm