三角形用英语怎么说

A triangle is a three-sided geometric figure with three angles and three sides. It is one of the basic shapes in geometry and can be formed by joining any three points together. The sides of a triangle are called vertices, and the angles between them are called sides. There are many different types of triangles, such as right triangles, acute triangles, and obtuse triangles. Triangles are used in various fields, including mathematics, physics, and engineering. They are also used in everyday life, such as in building structures and making patterns.