圓形/弧/扇形 | Circles, Arcs and Sectors

影片內容:

00:17 – 圓形術語 | terminology of circles
01:07 – 圓形的周界及面積 | circumference and areas of circles
03:59 – 弧的長度 | lengths of arcs
05:47 – 扇形的面積 | areas of sectors
06:51 – 例子 1 | example 1
08:23 – 例子 2 | example 2

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