Jawabanmu

2014-06-10T17:35:03+07:00
2014-06-10T17:36:48+07:00
  90 derajat/ 360 derajat × L
= 1/4 × π × r²
= 1/4 × 22/7 × 3,5²
= 1/4 × 38,5cm²
= 9,625cm²

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