评论 来源:互联网 时间:2023-05-04 11:16:57
【资料图】
1、原来的半径:62.8÷3.14÷2=10米后来的半径:10+2=12米3.14×12×12-3.14×10×10=138.16平方米面积增加了138.16平方米。
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