Đề thi Olympic Tiếng Anh lớp 9 vòng 28 năm 2013 - 2014

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?

A square is circumscribed about a circle. What is the ratio of the area of the circle to the area of the square?

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?

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?

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'

If a figure is a triangle, what would make the figure an isosceles triangle?

A circular swimming pool with a diameter of 20 feet is located in the center of a square cement patio that measures 25 feet on each side. What is the area of the cement patio, to the nearest square foot?

What is a + b?

How many pieces of pipe, each 20 meters long, would be required to construct a pipeline 1 kilometer in length?

Justin is driving from Riverton to Rock Springs, a distance of 144 miles. He plans to stop along the way for 15 minutes. How fast must Justin drive in order to average 64 miles per hour for the whole trip, including the time when he stops?