思路:
1)过长方形顶点把圆画完整
2)根据对称关系,就着图画出圆的外接正方形,边长等于直径
3)列出勾股定理 及长方形边长关系 得:R=5.
思路:
1)过长方形顶点把圆画完整
2)根据对称关系,就着图画出圆的外接正方形,边长等于直径
3)列出勾股定理 及长方形边长关系 得:R=5.
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