How did they figure out the area of a circle is πR²? [video](youtube.com)1 ポイント·投稿者 suprjami·8 か月前·0 コメントyoutube.comHow did they figure out the area of a circle is πR²? [video]https://www.youtube.com/watch?v=mY_5-KeovKc0 コメントコメントを投稿—