user-avatar
halee275
2 năm trước
Cho hai điểm A,B cách nhau 3cm. Vẽ đường tròn (A;2,5cm) và đường tròn (B;1,5cm). Hai đường tròn này cắt nhau tại C và D. a) Tính CA, DB b) Tại sao đường tròn (B;1,5cm) cắt đoạn thẳng AB tại trung điểm I của AB ? c) Đường tròn (A;2,5cm) cắt đoạn thẳng AB tại K. Tính BK. giúp mình với huhuhuhu
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

I.Choose the word in each line that has different stress pattern. 1.A. ecology B. environment C. autography D. residential 2. A. physiography B. alternatively C. criminology D. unsuccessfully 3. A. temporary B. geology C. emergency D. logography 4. A. astrology B. unnatural C. medication D. demography 5. A. voluntary B. apology C. television D. nationalize II. Complete each sentence with the correct word from the box. drought flood hurricane landslide tornado 1.When there is a _____________, a lot of water covers an area where the usually isn’t water. 2. A______________ refers to a long time without rain. 3. When there is _____________, a lot of rocks and earth fall down a hill. 4. A __________________ is a storm with a lot of wind that moves over water. 5. A__________________ is a storm in which the air moves very quickly in a circle. III. Complete the sentences with the past perfect form of the verbs in brackets. 1.Anita said she was very sorry for what she (do)…………………………… 2. When Sam (pay)…………………. The bill, we left the restaurant and went home. 3. It wasn’t surprising that she was tired .She (not sleep)………………….. for two days. 4. The road was blocked because a lorry (break down)……………………….. 5. My mother felt very nervous on the plane because she (not fly)………………..before. 6……………………………….(they/go) home when you arrived? 7. I (hear)……………the story before , so I didn’t find it very interesting. 8. After she (try on)…………………….. all the dresses in the shop, she bought the most expensive one. 9. They (not have)………………..breakfast when I got up. 10. The children were very excited because they (not see)………………….a tiger before. IV. Complete the sentences withthe correct form of the verbs in brackets. 1.After Nick (do)………………..his homework , he (go)………………..to bed last night. 2. Mai (live)……………..in Hai Phong for five years before she (move)…………… to Ha Noi three years ago. 3. Phong (tell)……………..me yesterday that he (learn)……………..French for a year. 4. Ms Hong (work)……………….at our school for twenty years before she (retire)………….last June. 5. By the time I (get)………………….to Nick’s house , his party (already/start)…………….. 6. When we (come) ………………………..back to our home village last month , it (change)……………………………so much. 7. By the time the bus (come)……………this morning, Duong (wait)………………..for it for half an hour.

Fill in the blank with a word/ phrase in the box. trains discourage transport expensive example problem cities pollution Traffic congestion in many (1) around the world is severe. One possible solution to this (2) is to impose heavy taxes on car drivers and use this money to make public transport better. One of the first benefits of such a measure is that the heavy taxes would (3) car owners from using their cars because it would become very (4) to drive. This would mean that they would begin to make use of public (5) instead, thus reducing traffic problems and (6) as well. Another benefit would be that much more use would be made of public transport if it was improved. It is often the case that public transport in cities is very poor. For (7) , we often see old buses and (8) that people would rather not use. High taxes would generate enough money to make the necessary changes giúp với ạ

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team