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标题 的副本

Published on Apr 04, 2016

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PRESENTATION OUTLINE

六十九中 李金霖
Photo by Dominic Alves

圆的周长

直径乘兀 rx兀
Photo by Andreas.

圆的面积

半径2x兀

圆有无数条半径

(或直径)
Photo by XcBiker

要记住

看圆的知识点
Photo by Ben Grey

再见

李金霖
Photo by StuartWebster