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這四個圓弧所圍成的陰影部分的面積是四個半圓的和减去正方形面積 邊長是12釐米的正方形面積為12*12=144平方釐米 半圓直徑為12cm,半徑為6cm,面積為6*6*π/2=18πcm 陰影部分的面積=18π*4-144=72π-144≈82.08平方釐米 有參攷但有問必回,
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