I君のおうちに行きました。
円についての用語を確認し、半径と直径の違い、そして半径を２倍すると直径になることがわかりました！
半径と直径
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半径と直径 家庭教師ガッツ //esoulc.com/wp-content/uploads/2020/03/gsc-logo.png
