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p = 40 : 2 - 4 = 16
l = 4
K = 2 × ( p + l )
= 2 × ( 16 + 4 )
= 2 × 20
= 40 cm
L = p × l
= 16 × 4
= 64 cm²
Jadi, luas bangun tersebut adalah 64 cm²
Semoga membantu ^_^