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jari-jari kecil = 2/3 x 21 = 14 cm
Luas besar = 1/2x22/7x21² = 693 cm²
Luas kecil = 1/2x22/7x14² = 308 cm²
Luas arsir = L besar - L kecil = 693 - 308 = 385 cm² (A)