The more convenient a triangle is to make, the more likely it is the correct shape you have to form to generate part of the complete Vertex picture. Once a line is formed into part of a triangle ...

Look for arcs inside each vertex. The same number of arcs indicate equal angles. Different numbers of arcs indicate different angles. To identify the symmetry of a triangle: Count how many ways ...

The vertex shader is used to transform the attributes of vertices (points of a triangle) such as color, texture, position and direction from the original color space to the display space.