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baooanh02032001
2 năm trước
Cho tứ giác ABCD. Gọi E, F, G, H theo thứ tự là trung điểm của BD, AB, AC, CD a) Chứng minh rằng EFGH là hình bình hành. b) Cho AD = a, BC = b . Tính chu vi của hình bình hành EFGH .
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Cornwall is situated in the south-west of England. It is famous for its beautiful scenery. There is not much industry so many people still earn their living by fishing. Another important source of income is tourism. There are a lot of tea-shops, souvenir shops and above all "bed and breakfast". You can see signs for these small hotels everywhere. Most of them are pretty houses or bungalows with nice gardens and they are run by family who lives there. Cornwall is also well-known for its history and legends. For example, in Titagel you can visit the ruins of King Arthur's Castle where King Arthur is said to have sat with his knights at the famous round table. Tourists often come to visit Cornwall in summer because the weather is warm and sunny. 1. Where is Cornwall situated? 2. Why do many people still earn their living by fishing?' 3. Is Cornwall famous for its history and legends? 4. Who(m) are the hotels run by?

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