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= 4 cm²
Lpersegi = s x s
= 4 x 4
= 16 cm² - 4 cm²
= 12 cm²
Lpersegi panjang = p x l
= 12 x 6
= 72 cm² - 4 cm²
= 68 cm²
Ltotal = 12 + 68 = 80 cm² (C)