π[(33/2)²-(14/2)²]-π[(26.4/2)²-(14.4/2)²]
=3.14×223.25-3.14×122.4
=316.669(㎡)
π[(33/2)²-(14/2)²]-π[(26.4/2)²-(14.4/2)²]
=3.14×223.25-3.14×122.4
=316.669(㎡)
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