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alas segitiga = √ 6² - 2² = √ 36 - 4 = √32 = 4√2
luas segitiga = 1/2 × alas × tinggi
= 1/2 × 4√2 × 2
= 4√2 cm²
luas persegi panjang = alas × tinggi
= 12 × 8
= 96 cm²
luas total = 96 + 4√2 cm²