Nối A với B. (O) có \(\widehat{ACB}\) là góc nội tiếp chắn \(\stackrel\frown{AB}\), \(\widehat{ABM}\) là góc tạo bởi tia tiếp tuyến AM và dây AB chắn \(\stackrel\frown{AB}\) nên \(\widehat{ABM}=\widehat{ACB}=70^o\)

MA, MB là 2 tiếp tuyến của (O) tại A, B nên MA = MB => \(\Delta ABM\) cân tại M \(\Rightarrow\widehat{BAM}=\widehat{ABM}=70^o\)

\(\Delta AMB\) có \(\widehat{BAM}+\widehat{ABM}+\widehat{AMB}=180^o\Rightarrow\widehat{AMB}=180^o-\left(\widehat{BAM}+\widehat{ABM}\right)=180^o-70^o-70^o=40^o\)

B - D - A - C

A - B - B - A

A - B - C - B - A - D - C - D - A - D

B - C - B - A - D - B

Nam didn't feel well, so he stayed at home.

I. Rewrite the sentences with the same meaning. 1. Peter spent two weeks visiting Hanoi. It took _______Peter two weeks to visit Hanoi_________. 2. It’s a good idea to have a tour guide when you travel somewhere. You should _________have a tour guide when you travel somewhere___________. 3. It’s necessary to speak English well if you want to study abroad. You need ____________to speak English well if you want to study abroad__________. 4. I felt sick yesterday. However, I went to school. Although ____________I felt sick yesterday, I went to school_________ 5. The film wasn’t good, so I felt asleep. Because _________the film wasn't good, I felt asleep_________.

Exercise 2: Choose the word whose main stressed syllable is placed differently from that of the other in each group. 6. A. par'ticipant B. en'vironment C. ex'perience D. compe'tition 12. A. his'toric B. de'lighted C. 'annual D. an'noying 13. A. con'clusion B. tra'dition C. at'traction D. 'evidence 14. A. 'sightseeing B. 'stadium C. souve'nir D. 'history 15. A. re'lax B. 'famous C. 'photo D. 'postcard

Therefore

học đủ sống:))