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Ok,itu jawabanya.......^_~
= 1/4 × 3,14 × 12cm × 12cm
= 1/1 × 3,14 × 3cm × 12cm
= 3,14 × 3cm × 12cm
= 9,42cm × 12cm
= 113,04cm²
Maaf kalau salah dan semoga bermanfaat