*)panjang busur = x°/360°. π D
11 = x°/360°. 22/7. 21
11 = x°/360°. 66
11/66. 360° = x°
1/6. 360° = x°
60° = x°
*)L = 60°/360°. π r²
= 1/6. 22/7. 10,5²
= 1/3. 11/7. 110,25
= 1/3. 11. 15,75
= 57,75 (D)
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*)panjang busur = x°/360°. π D
11 = x°/360°. 22/7. 21
11 = x°/360°. 66
11/66. 360° = x°
1/6. 360° = x°
60° = x°
*)L = 60°/360°. π r²
= 1/6. 22/7. 10,5²
= 1/3. 11/7. 110,25
= 1/3. 11. 15,75
= 57,75 (D)