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= 20 × 20
= 400 cm²
L persegi panjang = p × l
= 15 × 10
= 150 cm²
L daerah yang tidak diarsir = L persegi + L persegi panjang - 2x L yang diarsir
= 400 cm² + 150 cm² - 2 × 67
= 550 cm² - 134 cm²
= 416 cm²