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L = at
= 18 *16
= 288 cm²
2. menghitung nilai NP (tinggi jajargenjang)
L = at
t = L/a
= 288/ 28
= 10.28 dibulatkan
mohon dikoreksi dan semoga membantu
28 × NP = 288
NP = 288÷28 = 1 + 2/7