Hình Lập Phương Có Tất Cả Bao Nhiêu Mặt Phẳng đối Xứng?

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Câu hỏi Toán học

Hình lập phương có tất cả bao nhiêu mặt phẳng đối xứng? A.3 B.9 C.6 D.4 Đáp án và lời giải Đáp án:B Lời giải:Lời giải Chọn B Hình lập phương có tất cả 9 mặt đối xứng gồm: 3 mặt phẳng chia hình lập phương thành 2 khối hộp hình chữ nhật. 6 mặt phẳng chia hình lập phương thành 2 khối lăng trụ tam giác.

Câu hỏi thuộc đề thi sau. Bạn có muốn thi thử?

Bài tập trắc nghiệm 15 phút Tính chất đối xứng và tính chất hình học khác của khối đa diện,… - Toán Học 12 - Đề số 2

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Một số câu hỏi khác cùng bài thi.

• Hình tứ diện đều có bao nhiêu mặt phẳng đối xứng?
• Hình hộp chữ nhật có ba kích thước đôi một khác nhau có bao nhiêu mặt phẳng đối xứng?
• [2H1-1. 2-2] Số mặt phẳng đối xứng của bát diện đều là:
• [2H1-3. 4-3] Cho hình chóp S. ABCD có đáy là hình chữ nhật; AB=a; AD=2a . Tam giác SAB cân tại S và nằm trong mặt phẳng vuông góc với đáy. Góc giữa đường thẳng SC và mp ABCD bằng 45° . Gọi M là trung điểm của SD . Tính theo a khoảng cách d từ điểm M đến SAC .
• Hình lập phương có tất cả bao nhiêu mặt phẳng đối xứng?
• Hình chóp tứ giác đều có bao nhiêu mặt phẳng đối xứng?
• Hình lập phương có bao nhiêu mặt phẳng đối xứng ?
• Trong không gian cho hình vuông H. Hỏi hình H có bao nhiêu trục đối xứng?
• Hình lăng trụ đứng có đáy là tam giác cân nhưng không phải là tam giác đều có bao nhiêu mặt phẳng đối xứng?
• Hình lăng trụ đứng tam giác đều có bao nhiêu mặt phẳng đối xứng?

Một số câu hỏi khác có thể bạn quan tâm.

• Trong điều kiện thích hợp glucozơ lên men tạo thành khí CO2 và chất nào dưới đây?

• Complete the following passage

  I go on the Internet every day, but I’ve never (1) __________ more than an hour at a time online. I’ve got laptop and also a smartphone, so I can (2) ___________ the Internet anywhere. Today, for instance, I’ve been (3) ____________ three times.

  Mainly I just (4) ____________ my friends. I read online magazines and I look (5) __________ information, too. I also compare prices of things, (6) ___________ I’ve never bought anything online because I don’t think it’s safe.

  I’m not an Internet addict, but some of my friends (7) ___________. One friend of mine always looks (8) ___________ because he spends all night online. Although he’s got a lot of bad marks for the exams, he hasn’t (9) ___________ his habits.

  In my experience, it’s very useful for people who use the Internet (10) ____________.

  Question 8:

• Theo Hiến pháp 2013, quyền tự do đi lại và cư trú ở trong nước, có quyền ra nước ngoài và từ nước ngoài về nước theo luật định là quyền cơ bản của công dân trong lĩnh vực nào sau đây?

• Hợp chất nào sau đây thuộc loại đipeptit?

• Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.

          Lighthouses are towers with strong lights that help mariners plot their position, inform them that land is near, and warn them of dangerous rocks and reefs. They are placed at prominent points on the coast and on islands, reefs, and sandbars.

         Every lighthouse has a distinctive pattern of light known as its characteristic. There are five basic characteristics: fixed, flashing, occulting, group flashing, and group occulting. A fixed signal is a steady beam. A flashing signal has periods of darkness longer than periods of light, while an occulting signal’s periods of light are longer. A group-flashing light gives off two or more flashes at regular intervals, and a group - occulting signal consists of a fixed light with two or more periods of darkness at regular intervals. Some lighthouses use lights of different colors as well, and today, most lighthouses are also equipped with radio beacons. The three types of apparatus used to produce the signals are the catoptric, in which metal is used to reflect the light; the dioptric, in which glass is used; and the catadioptric, in which both glass and metal are used.

          In the daytime, lighthouses can usually be identified by their structure alone. The most typical structure is a tower tapering at the top, but some, such as the Bastion Lighthouse on the Saint Lawrence River, are shaped like pyramids, and others, such as the Race Rock light, look like wooden houses sitting on high platforms. Still others, such as The American Shoal lighthouse off the Florida Coast, are skeletal towers of steel. Where lighthouses might be contused in daylight, they can be distinguished by day- marker patterns - designed of checks and stripes painted in vivid colors on lighthouse walls.

         In the past, the job of lighthouse keeper was lonely and difficult if somewhat romantic. Lighthouse keepers put in hours of tedious work maintaining the lights. Today, lighthouses are almost entirely automated with humans supplying only occasional maintenance. Because of improvements in navigational technology, the importance of lighthouses has diminished. There are only about 340 functioning lighthouses in existence in the United States today, compared to about 1,500 in 1900, and there are only about 1,400 functioning lighthouses outside the United States. Some decommissioned lighthouses have been preserved as historical monument.

  Which of the following is NOT mentioned in the passage as one of the functions of lighthouses?

• * Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 43 to 50.

  Cooperation is the common endeavor of two or more people to perform a task or reach a jointly cherished goal. Like competition and conflict, there are different forms of cooperation, based on group organization and attitudes.

  In the first form, known as primary cooperation, group and individual fuse. The group contains nearly all of each individual’s life. The rewards of the group’s work are shared with each member. There is an interlocking identity of individual, group and task performed. Means and goals become one, for cooperation itself is valued.               

  While primary cooperation is most often characteristic of preliterature societies, secondary cooperation is characteristic of many modem societies. In secondary cooperation, individuals devote only part of their lives to the group. Cooperation itself is not a value. Most members of the group feel loyalty, but the welfare of the group is not the first consideration. Members perform tasks so that they can separately enjoy the fruits of their cooperation in the form of salary, prestige, or power. Business offices and professional athletic teams are examples of secondary cooperation.

  In the third type, called tertiary cooperation or accommodation, latent conflict underlies the shared work. The attitudes of the cooperating parties are purely opportunistic: the organization is loose and fragile. Accommodation involves common means to achieve antagonistic goals: it breaks down when the common means cease to aid each party in reaching its goals. This is not, strictly speaking, cooperation at all, and hence the somewhat contradictory term antagonistic cooperation is sometimes used for this relationship.

  Which of the following best describes the overall organization of the passage?

• Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 30 to 34.

  Body language is a vital form of communication. In fact, it is believed that the various forms of body language contribute about 70 percent to our comprehension. It is important to note, however, that body language varies in different cultures. Take for example, eye movement. In the USA a child is expected to look directly at a parent or teacher who is scolding him/her. In other cultures the opposite is true. Looking directly at a teacher or parent in such a situation is considered a sign of disrespect.

  Another form of body language that is used differently, depending on the culture, is distance. In North America people don't generally stand as close to each other as in South America. Two North Americans who don't know each other well will keep a distance of four feet between them, whereas South Americans in the same situation will stand two to three feet apart. North Americans will stand closer than two feet apart only if they are having a confidential conversation or if there is intimacy between them.

  Gestures are often used to communicate. We point a finger, raise an eyebrow, wave an arm – or move any other part of the body – to show what we want to say. However, this does not mean that people all over the world use the same gestures to express the same meanings. Very often we find that the same gestures can communicate different meanings, depending on the country. An example of a gesture that could be misinterpreted is sticking out the tongue. In many cultures it is a sign of making a mistake, but in some

  places it communicates ridicule.

  The dangers of misunderstanding one another are great. Obviously, it is not enough to learn the language of another culture. You must also learn its non-verbal signals if you want to communicate successfully.

  Which form of body language is NOT mentioned in the passage?

• Mark the letter A, B, C, or D to indicate the sentence that is closest in meaning to each of the following questions.

  A: "Can you concentrate on other things when you are listening to music?" B: “_________.”

• Với công thức phân tử C8H10, số đồng phân ankylbenzen là:

• I won't buy that car because it has too much _____ on it

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