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Verified answer
Panjang busur = (α° /360°) 2 π r11 = (α / 360°) 2 x 22/7 x 14
11 = 0,244 α
α = 11 / 0,244
= 45°
Luas juring = (α° / 360°) π r²
= (45° / 360°) 22/7 x 14²
= 77 cm²