中二数学 第五课 circles

Question

求解， 需要步骤及答案。 谢谢。

Comments

哈囖？

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？？

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在线吗？

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刚刚怎么失踪了？

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刚刚在复习

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哦
现在呢？

Answer 1

Hi, I don't know if the answers given are wrong or I careless, the answer I counted is 0.78 cm

1. radius=3.1cm, OQ=radius, OQ=3.1cm

2. QS=6cm, R is the midpoint of QS, thus RQ=3cm

3. Given that angle OQS=90 degree, which means that ORQ=90 degree

4. By using Pythagoras theorem, OR²=3.1²-3²

OR=0.78 cm

Hope my solutions can help you!

Comments

Thanks!