A. Lamps

B. Beds

C. Desks

D. Phones

Giải:

Từ O ta kẻ tia Om sao cho Om// Ax mà Ax// By

=> Ax// Om// By

Ta có: xAO + AOm = 180* (2 góc trong cùng phía)

Hay: 130* + AOm = 180*

AOm = 180* - 130*

AOm = 50*

Và: mOB = OBy = 110* (2 góc so le trong)

=> mOA + AOB = mOB (OA nằm giữa Om và OB)

Hay: 50* + AOB = 110*

=> AOB = 110* - 50*

AOB = 60*

=> AOB = 60*

* là độ và bạn thêm ký hiệu góc vô nhé!

Hình vẽ:

Tham khảo:

85 Tran Quoc Hoan Rd. Hanoi
Nov 12, 2016
Dear David,
I'm happy to hear you are in Hanoi again. This time, how about watching a water puppet show? I'm sure you'll like it. Is Saturday evening OK for you? It's at 57B Dinh Tien Hoang St., Hoan Kiem Dist. The show begins at 8 p.m., so let's meet at 7.45 outside the theatre. I hope we'll have a happy time together.
Looking forward to seeing you there.
Have a nice day!
Cheers,
Hoang

Tham khảo:

Being able to make a difference in the lives of people is a wonderful thing to me. That's why I take part in volunteer work. I've been a volunteer for over three years. Once or twice a week, usually on weekends, I teach English and Math to poor children in Long Bien district. My friends and I also encourage other people to donate books to them. We also tutor some young children who can't go to school.

Bạn có thể tham khảo đoạn văn này:

My dream house is a large villa. It is near the coast, surrounded by rows of coconut trees and the blue sea. There are sixteen rooms in my house and half of them for relaxation and entertainment. It has a big garage so that I can store my super cars there. My house has wind power or solar energy. I use hi-tech and automatic machines such as a smart clock, modern fridge, automatic dishwasher and washing machine. They can be controlled by voice and help me tell the time, forecast weather, preserve food and wash dishes and clothes. There is a super smart TV in my house. I might surf the internet, watch my favourite TV programmes from space or contact friends on other planets by this fantastic TV. I might also join online classes on TV and not have to go to school.

Bạn thể tham khảo đoạn văn này:

My dream house is a large villa. It is near the coast, surrounded by rows of coconut trees and the blue sea. There are sixteen rooms in my house and half of them for relaxation and entertainment. It has a big garage so that I can store my super cars there. My house has wind power or solar energy. I use hi-tech and automatic machines such as a smart clock, modern fridge, automatic dishwasher and washing machine. They can be controlled by voice and help me tell the time, forecast weather, preserve food and wash dishes and clothes. There is a super smart TV in my house. I might surf the internet, watch my favourite TV programmes from space or contact friends on other planets by this fantastic TV. I might also join online classes on TV and not have to go to school.

This is an English book.