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= 42 cm x 14 cm
= 588 cm²
Luas segitiga = 1/2 x a x t
= 1/2 x 28 cm x 14 cm
= 196 cm²
Luas daerah yang diarsir = 588 cm² - (2 x 196 cm²)
= 588 cm² - 392 cm²
= 196 cm² (A)