思路:
1)過長方形頂點把圓畫完整
2)根據對稱關係,就著圖畫出圓的外接正方形,邊長等於直徑
3)列出勾股定理 及長方形邊長關係 得:R=5.
思路:
1)過長方形頂點把圓畫完整
2)根據對稱關係,就著圖畫出圓的外接正方形,邊長等於直徑
3)列出勾股定理 及長方形邊長關係 得:R=5.
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