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= 8cm x 8cm
= 64cm²
Luas 2 Segitiga = ½ x a x t
= 2 (½ x 8cm x 8cm)
= 2 (½ x 64cm²)
= 2 x 32 cm²
= 64 cm²
Luas bangun tersebut = 64 cm² + 64 cm² = 128 cm²
Jadi, jawabannya adalah B. 128 cm²