Điểm thi SAT (Scholastic Assessment Test) là một trong những yêu cầu quan trọng được hầu hết các trường Cao đẳng, Đại học tại Mỹ sử dụng nhằm quyết định việc chấp nhận sinh viên theo học. Điểm SAT còn là căn cứ quan trọng để xét cấp học bổng. Vì vậy nếu bạn đang ước mơ du học Mỹ, hãy bắt đấu chuẩn bị cho kỳ thi SAT càng sớm càng tốt. Có thể nói, kỳ thi SAT là thước đo khá chính xác khả năng tư duy và khả năng học tập thành công tại các trường Cao đẳng,. | Geometry 225 Exercise 3 Exercise 4 1. A 1. 14x 140 x 10 A Find the midpoint of AB by averaging the x coordinates and averaging the y coordinates. 2. C O is the midpoint of AB. The rectangle is 30 by 40 . This is a 3 4 5 right triangle so the diagonal is 50 . 2. C The altitude in an equilateral triangle is always 2 side -43. x 4 - 2 x 4 4 x 0 2 y 6 1 y 6 2 y -4 A is the point 0 -4 . 3. A d ự 8 - 4 2 6 - 3 2 442 32 7 16 9 725 5 3. D This is an 8 15 17 triangle making the missing side 3 17 or 51. 4. A The diagonal in a square is equal to the side times 72 . Therefore the side is 6 and the perimeter is 24. 5. C A 4. D Sketch the triangle and you will see it is a right triangle with legs of 4 and 3. Arsa 7- - b - h 7- - 4 - 3 6 2 2 5. A Area of a circle nr1 nr2 16n r 4 Triangle ABC is a 3 4 5 triangle with all sides multiplied by 5. Therefore CB 20. Triangle ACD is an 8 15 17 triangle. Therefore CD 8. CB - CD DB 12. The point 4 4 lies at a distance of 7 4 - 0 2 4- 0 2 73Ĩ units from 0 0 . All the other points lie 4 units from 0 0 . 226 Chapter 13 Exercise 5 Exercise 6 1. A Angle B Angle C because of alternate interior angles. Then Angle C Angle D for the same reason. Therefore Angle D 30 . 2. D Extend AE to F. AA AEFC ACEF must equal 100 because there are 180 in a triangle. A AEC is supplementary to ACEF. A AEC 80 3. E A1 A3 A2 A3 180 A2 50 4. C Since ABEG and AEGD add to 180 halves of these angles must add to 90 . Triangle EFG contains 180 leaving 90 for AEFG. 5. C 1. D Represent the angles as x 5x and 6x. They must add to 180 . 12x 180 x 15 The angles are 15 75 and 90 . Thus it is a right triangle. 2. D There are 130 left to be split evenly between the base angles the base angles must be equal . Each one must be 65 . 3. E c The exterior angle is equal to the sum of the two remote interior angles. 4x 100 x 25 Angle A 3x 75 4. D The other base angle is also x. These two base angles add to 2x. The remaining degrees of the triangle or 180 - 2x are in the
