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Luas persegi panjang besar = (12 + 1 + 1 ) x (15 + 1 + 1)
= 14 x 17
= 238 cm²
Luas Persegi panjang kecil = 12 x 15
= 180 cm²
Luas Keramik = 238 - 180 = 58 cm² (A)
Smoga membantu ^_^