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⇒ Luas tembereng = Luas juring - Luas segitiga
= (α/360∞ x Luas lingkaran) - (1/2.a.t)
= (90/360 x 22/7.21²) - (1/2. 21. 21)
= (346,5) - (220,5)
= 126cm²
Maaf kalo salah :) semoga membantu