Ta có: \(153,86:3,14=49\)= 7 x 7

\(\Rightarrow\)Bán kính của hình tròn là 7 cm

Chu vi hình tròn là: 7 x 2 x 3,14 = 43,96 (cm)

\(\Rightarrow\)A) Đ             B) S

1. Their mother told them not to make so much noise.
2. The traffic policeman told me to show him my driving lience.
3. Mrs. Jackson asked Tim if he could give her a hand.
4. The lifeguard told the boys not to swim out to far.
5. Nam told the taxi driver to turn left at the first traffic light.
6. She told her son to go straight upstairs and get into bed.
7. The policeman told us not to touch anything in the room.

8. Mary asked John if he could carry her suitcase.

9. Mr Atkins said to David that he hadn't to leave the door unlocked.

10. I asked my neighbors to turn the music down.

chịu

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