Fortune-telling symbol triangle _ triangle fortune-telling method

The mean of that mathematical symbol "△"

The mathematical symbol "△" represents a triangle.

In mathematics, it is complicated to write triangles in the calculation process, and the word "delta" is usually used instead of the word "triangle". For example, when describing a triangle consisting of three ABC points, "delta ABC" is often used for simple writing.

Extended data:

Some common properties of triangles in mathematics;

1. On the plane, the sum of the interior angles of a triangle is equal to 180 (interior angle sum theorem).

2. On the plane, the sum of the outer angles of a triangle is equal to 360 (the theorem of the sum of outer angles).

3. On the plane, the outer angle of a triangle is equal to the sum of two non-adjacent inner angles.

Inference: An outer angle of a triangle is greater than any inner angle that is not adjacent to it.

4. There are at least two acute angles among the three internal angles of a triangle.

5. At least one angle in the triangle is greater than or equal to 60 degrees, and at least one angle is less than or equal to 60 degrees.

6. The sum of any two sides of a triangle is greater than the third side, and the difference between any two sides is less than the third side.