user-avatar
Mariepham
2 năm trước
a) Biết AH = 12cm, CH = 5cm. Tính AC, AB, BC, BH. b) Biết AB = 30cm, AH = 24cm. Tính AC, CH, BC, BH. c) Biết AC = 20cm, CH = 16cm. Tính AB, AH, BC, BH. d) Biết AB = 6cm, BC = 10cm. Tính AC, AH, BH, CH. e) Biết BH = 9cm, CH = 16cm. Tính AC, AB, BC, AH. Bài 2. Cho tam giác ABC vuông tại A có góc B = 60°, BC = 20cm. a) Tính AB, AC b) Kẻ đường cao AH của tam giác. Tính AH, HB, HC. Bài 3. Giải tam giác ABC vuông tại A, biết: a) AB = 6cm, góc B = 40° b) AB = 10cm, góc C = 35° c) BC = 20cm, góc B = 58° d) BC = 82cm, góc C = 45° e) BC = 32cm, AC = 20cm f) AB = 18cm, AC = 21cm Bài 4. Không sử dụng bảng số và máy tính, hãy sắp xếp các tỉ số lượng giác sau theo thứ tự tăng dần: sin 65°; cos 75°; sin 70°; cos 18°; sin 79°
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

Exercise 10: Choose the correct answers. 1. On Saturday, my friend Paul went fishing and he caught ....................... A. three fish B. three fishes C. three items of fish D. three of fishes 2. Can I borrow ....................... from you? I’ve left mine at home and I want to write some notes. A. paper B. a slice of paper C. a paper D. a piece of paper 3. Your ....................... blunt. A. scissor are B. scissor is C. scissors are D.scissors is 4. ....................... supposed to be a science. A. Economy is B. Economics is C. Economics are D. Economic is 5. ....................... something not everybody likes talking about. A. Politics is B. Politics are C. Politic is D. Politices are 6. Warm ....................... essential in Siberia. A. clothes are B. cloths are C. cloth is D. cloth are 7. The ....................... that we must stay here because they are coming. A. new are B. new is C. newes is D. news is 8. My ....................... the largest in the neighborhood. A. families is B. family are C. familys are D. family is 9. I have known them since they ....................... A. are babies B. were baby C. were babies D. were babys 10. His new ....................... too long. A. trouser are B. trouser is C. trouseres are D. trousers are

ai giúp mình bài đọc này với ạ, mình cảm ơn nhìu :3 V. Read the following passage, then choose the correct answer to questions. Planet earth is part of a system of planets and their moons, as well as numerous asteroids and comets which (41)_________around a huge star we call the Sun. The Sun itself (41)_________of gas. Nuclear reactions inside its core (43)_______the heat and light that make life on the Earth (44)________. The Earth is the third of four small terrestrial (Earth like) planets that orbit close to the (45)________. Further out in our Solar System are four huge gas planets, while distant Pluto, (46)________ planet, is made (47)_________rock and ice. Our Earth is one of the ten planets that orbit the Sun- a huge, burning-hot star in the center of our Solar System. The Solar System and all the stars in the (48)________are part of our galaxy-the Milky Way, which (49)_______as many as 200 billions stars. Beyond our galaxy (50)________millions more galaxies. They all add together to make up the Universe. 41. A. run B. orbit C. turn D. walk 42. A. consists B. remains C. includes D. maintains 43. A. produce B. product C. production D. productive 44. A. able B. possibility C. possible D. ability 45. A. Earth B. Mars C. Mercury D. Sun 46. A. the smaller B. smallest C. the most smallest D. the smallest 47. A. from B. of C. for D. in 48. A. space B. Universe C. Moon D. sky 49. A. consists B. makes from C. stays D. contains 50. A. is B. are C. to be D. get

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