There are four kinds of equilateral triangles: isosceles triangle with three equal sides, right triangle with two equal sides and right triangle with two equal sides, which meet the conditions of isosceles triangle and right triangle at the same time. There is an irregular triangle in the middle.

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Acute triangle, obtuse triangle, right triangle, equilateral triangle, isosceles triangle, degenerate triangle.

1. acute triangle 2. Obtuse triangle 3. Right triangle 4. Equilateral triangle 5. Isosceles triangle 6. Degenerate triangle (triangle with zero area)

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equilateral triangle

isosceles triangle

Isosceles right triangle

Irregular triangle

Triangular cone

Right triangle acute angle and obtuse triangle obtuse triangle is a triangle with one angle being obtuse (greater than 90) and the other two angles being less than 90. All internal angles of an acute triangle are acute angles (less than 90). A right triangle is a triangle whose angle is a right angle (90). The two sides of a right angle are called right angles, and the opposite side of the right angle is the hypotenuse; Or the longest side is called a string, the bottom side is called a hook (in other words), and the other side is called a strand. The acute triangle function can be obtained by the ratio of the sides of the right triangle with different angles. Equilateral triangle An equilateral triangle (also called a regular triangle) is a triangle with three equilateral sides. Its three internal angles are equal, all 60. This is an acute triangle. Let its side length be a, and its area formula is that the equilateral triangle is the shape of three regular polyhedrons: regular tetrahedron, regular octahedron and regular icosahedron. Six equilateral triangles can be combined into a regular hexagon. Isosceles triangle An isosceles triangle is a triangle with two equal sides (or two equal internal angles). Two equal sides in an isosceles triangle are called waist and the other side is called bottom. The point where two waists intersect is called the vertex, and the angle they form is called the vertex. The center of gravity, the center of the circle and the vertical center of the isosceles triangle are all located on the vertical line from the vertex to the bottom. The perpendicular bisector of the base of an isosceles triangle is just the bisector of the corresponding angle, and an equilateral triangle is a special form of an isosceles triangle. A triangle whose degenerated triangle area is zero.

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Wikipedia (a multilingual encyclopedia collaboration project based on wiki technology is also an online encyclopedia written in different languages, whose goal and purpose are to provide freedom for all mankind) is an open encyclopedia.

A triangle has an equilateral triangle.

Isosceles right triangle

Triangular cone

isosceles triangle

Irregular triangle

equilateral triangle

isosceles triangle

Isosceles right triangle

Irregular triangle

Triangular cone