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如題,這個半圓的直徑=長方形的長=12釐米 半圓面積=3.14×(12÷2)²;÷2=56.52(平方釐米) 長方形面積=12×8=96(平方釐米) 剪成後剩下紙板面積=96-56.52=39.48(平方釐米)
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