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= 784 cm²
daerah yang berwarna biru/ yang diarsir = π= 28cm ÷ 2 = 14cm
= 1 per 2 × 14cm × 14cm
= 7cm × 14cm
= 98cm²
yang biru/ yang diarsir = 784cm² - 98cm² = 686cm²
maaf kalau salah