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L=pi*(d/2)+d =10.28cm
3.14×5÷2+5=12.85(釐米)5÷2=2.5(釐米)3.14×2.52÷2=9.8125(平方釐米)答:這個半圓的周長是12.85釐米,面積是9.8125平方釐米.故答案為:12.85釐米,9.8125平方釐米.
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