How is a diamond bicycle frame constructed from two triangles?

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An African American family of four, all wearing helmets, rides bicycles together on a tree-lined country trail, with two children in front and two adults following behind. — bicycle Family bicycling on a country road.

The traditional diamond frame is the most common design for a bicycle, constructed by joining two distinct triangles of tubing:

The main triangle: This section is formed by the top tube, the seat tube, and the down tube.
The rear triangle: This section is formed by the seat tube, the chain stays, and the seat stays.

These two triangles share the seat tube as a common side, creating a rigid structure that supports the bicycle's components, including the crank and the steering assembly.1