area of a trapezoid area of a circle Learn how to find the area of a trapezoid using its parallel sides and height, or by splitting it into triangles and rectangles. See examples, practice problems and a proof of the formula
free area is a designated =Free trade area is a designated group of countries that have agreed to eliminate tariffs, quotas, and preferences on most goods among them. Tạm dịch: Khu vực thương mại tự do là một nhóm các quốc gia đã đồng ý loại bỏ thuế quan, hạn ngạch và ưu đãi đối với hầu hết hàng hóa trong số đó
area of a triangle Learn how to calculate the area of a triangle using different formulas and methods, such as base and height, trigonometry, side lengths, vectors, coordinates, and line integrals. See the history and examples of the area of a triangle in geometry and mathematics
