Chúng tôi xin giới thiệu phần trích dẫn nội dung của tài liệu đầu tiên trong bộ sưu tập Đề thi Olympic Tiếng Anh lớp 9 vòng 28 dưới đây:
Chọn câu trả lời tốt nhất cho những câu hỏi dưới đây.
1. Triangle JKL is drawn on a coordinate plane. It is a right triangle with hypotenuse JL. The slope of JK is 3/4. What is the slope of KL?
D. - 4/3
2. A square is circumscribed about a circle. What is the ratio of the area of the circle to the area of the square?
3. The vertices of ΔABC are A(2, 1), B(3, 4), and C(1, 3). If ΔABC is translated 1 unit down and 3 units to the left to create ΔDEF, what are the coordinates of the vertices of ΔDEF?
A. D(0, 1), E(1, 2), F(1, 3)
B. D(0, -1), E(0, 3), F(-2, -2)
C. D(-2, 2), E(0, 3), F(-1, 0)
D. D(-1, 0), E(0, 3), F(-2, 2)
E. D(1, -2), E(2, 1), F(0, 0)
4. One winter day, the temperature at sunset was 12°F. During that night, the temperature dropped 17°. By noon the next day, the temperature had increased by 9°, but it decreased 5° between noon and sunset. What was the temperature at sunset of the second day?
5. An overhead projector projects the shape of ΔABC onto a screen as shown in the diagram above. The screen is moved back 5 feet and the new ΔA'B'C' is seen on the screen. What relationship exists between ΔABC and ΔA'B'C'
A. The sides of ΔABC are congruent to the corresponding sides of ΔA'B'C'.
B. The angle measures of ΔA'B'C' are smaller than the corresponding angle measures of ΔABC.
C. The angle measures of ΔA'B'C' are greater than the corresponding angle measures of ΔABC.
D. ΔABC is similar to ΔA'B'C'.
E. ΔABC is congruent to ΔA'B'C'.
6. If a figure is a triangle, what would make the figure an isosceles triangle?
A. a right angle
B. three sides of unequal length
C. two acute angles
D. two sides of equal length
E. an obtuse angle
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