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9. L.lingkaran = phi x r² = 22/7 x 28² = 2464 cm²
11. L.1/2 lingkaran = 1/2 x phi x r² = 1/4 x 22/7 x 28² = 616 cm²
12. Jari2 = √(L x 7) : 22) = √(1386 x 7) : 22) = √9702 : 22 = √441 = 21 cm
Maaf ya,hanya menjawab 4 nomor.......