如果⊙O的直径为10cm，弦AB=6cm，那么圆心O到弦AB的距离为______

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问题填空题

如果⊙O的直径为10cm，弦AB=6cm，那么圆心O到弦AB的距离为______cm．

答案

如图，OA=OB=5cm，OD⊥AB，

由垂径定理知，AD=3cm，

∴OD=

OA2-AD2

=4（cm）．

填空题

根据句意写出所给单词的正确形式。

1. One of the ________ (visit) caught a cold yesterday

2. Don't make any excuses. It's ________ (useful).

3. Most bosses use ________ (few) people and ________ (little) money to do more work.

4. Please take the medicine ________ (two) a day.

5. In China, most schools are ________ (mix) schools.

6. She said, "I can teach ________ (me) English from now on."

7. In some American states, people can have ________ (drive) lessons at school.

8. We don't know this song very well because it's ________ (popular).

9. During our journey, it's often sunny. So it's a ________ (please) trip.

10. It's _______ (bored) to talk to a man of few words.

简答题

漫画《小康的后腿》说明了什么问题？

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