Cho hình chóp S. ABCD có tất cả các cạnh cùng bằng 12a, đáy là hình vuông. Gọi M, N lần lượt là trung điểm SA, SB và G là trọng tâm tam giác SCD. Tính diện tích thiết diện của hình chóp bị cắt bởi mặt phẳng (MNG).

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Mark the letter A, B, C, or D on your answer sheet to indicate the correct dniwer to each of TIẾ the following questions. Question 11: The law should not be concerned А. in chu solely economic factors B. on В. C. with a fuss asking from where he got the coins. Question 12: She began to D. to В. A. do B. take C. get D. make Question 13: On Sundays, we usually B. the shopping and clean the house Al l A. go B. do C. make D. offer Question 14: It is important to be aware the level of formality required at any social B. function. В. A2 1 A. in B. about С. of D. with in the first phase of the project. В. Question 15: This autumn, 200 students will g to В. A. participate B. take C. consist D. accept hỏ 1 B. Question 16: He glanced his watch and realized that it would be dark before he reached Ho Chi Minh City. khu A. for B. to С. on D. at ản vị bản v Question 17: My sister believes that what she does on the first day of the year will her luck during the whole year. ng to gc the h thu h thu A. exchange B. result C. influence D. provide a second Nobel Prize in Chemistry for her Question 18: In 1911, Marie Curie was discovery of the elements polonium and radium. ch ch h thấ A. awarded B. received C. decided D. announced Question 19: He worked hard so that he could earn enough money to his large ục đ giór family. A. continue B. complete C. increase D. support more clearly, we could get what he meant. D. explains nm - kícl ong s uông ng so Lông 1 g gió ong s ruông Question 20: If the teacher A. would explain B. had explained C. explained life much easier if you smile more often. C. will find Question 21: You D. have found A. would find B. find Question 22: I don't mind the fence. I've got plenty of free time. D. repaints C. repainting B. to repaint the pudding A. repaint to the dinner at my house. D. brought Question 23: She agreed ng so uông ! nại né B. bring C. bringing A. to bring along the street I saw my best friend. C. had cycled Question 24: While I D. cycles B. cycled with friends on Sundays. D. went A. was cycling Question 25: Mr. John allowed his children B. go C. going A. to go