There are eight kinds of triangles.

There are eight kinds of triangle pictures, as shown in the figure:

Introduction to triangle:

Triangle is a closed figure composed of three line segments on the same plane but not on the same straight line, which has applications in mathematics and architecture.

Ordinary triangles are divided into ordinary triangles (three sides are unequal) and isosceles triangles (isosceles triangles with unequal waist and bottom and isosceles triangles with equal waist and bottom, that is, equilateral triangles); According to the angle, there are right triangle, acute triangle and obtuse triangle, among which acute triangle and obtuse triangle are collectively called oblique triangle.

A closed figure composed of three line segments that are not on the same straight line is called a triangle. A figure surrounded by three straight lines on a plane or three arcs on a sphere is called a plane triangle; A figure surrounded by three arcs is called a spherical triangle, also known as a triangle.

A closed geometry consisting of three line segments connected end to end is called a triangle. Triangle is the basic figure of geometric figure. Isosceles triangle; An isosceles triangle refers to a triangle with two equal sides, which are called the waist of the triangle. In an isosceles triangle, two equal sides are called waist and the other side is called bottom.

The angle between the two waists is called the top angle, and the angle between the waist and the bottom edge is called the bottom angle. The two base angles of an isosceles triangle are equal (abbreviated as "equilateral angles"). The bisector of the vertex, the median line on the bottom and the height on the bottom of the isosceles triangle coincide. The bisectors of the two base angles of an isosceles triangle are equal (the median lines of the two waists are equal and the heights of the two waists are equal).