Để học tiếng anh nhanh và hiệu quả tốt nhất các bạn nên nhớ cách giải thích của từ đó bằng tiếng Anh, để vừa học từ vựng mà mình muốn vừa có thể học hoặc ôn lại các từ vựng khác. TRIANGLE (tam giác) A brolen line closed to bound a portion of a plane is called a polygon. A three sided polygon is called a triangle. The triangle is the simplest closed figure that you made. The side and shape cannot be changed if the side remain unchanged. This is not true of the other polygons. Thus, the triangle is called the ridgid polygon. CLASSIFICATION OF TRIANGLE ACCORDING TO ANGLES If one angle of a right angle, the triangle is called a right triangle . If one angle of a triangle is an obtuse angle, the triangle is called an obtuse triangle . If the angle of a triangle are all acute, the triangle is called an acute triangle. CLASSIFICATION OF TRIANGLE ACCORDING TO If all the sides of a triangle are of the same lengths, the triangle is called an equilateral triangle . If only two sides of a triangle are the same lenghths, the triangle is called an isosceles triangle . If no two sides of a triangle are the same lengths, the triangle is called a scalene triangle. The equal sides of an isosceles triangle are often called legs ; the third side of the isosceles triangle is called its base and the angle formed by the equal side is known as the vertex angle of the isosceles triangle. In a right triangle, the side opposite the right angle in a right triangle is its hypotenuse and the other two sides are legs. Một ngày chỉ cần vài từ thôi, nhưng nhiều ngày sẽ được nhiều từ. Cố gắng lên mng nhé! Cảm ơn mng đã ủng hộ
