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= 90°/360° x π x d
= 1/4 x 22/7 x 56 cm
= 44 cm
B) Luas juring AOB = ∠AOB/360° x Luas lingkaran
= 90°/360° x π x r²
= 1/4 x 22/7 x 28 cm x 28 cm
= 616 cm²
C) Luas Tembereng = Luas Juring - Luas segitiga
= 616 cm² - 1/2 x 28 cm x 28 cm
= 616 cm² - 392 cm²
= 224 cm²