What shape are some portions of a full frame typically formed into?

Some portions of a full frame are typically formed into a C-shaped design primarily due to structural requirements and strength. The C-shape provides additional rigidity and support, allowing the frame to absorb impacts better while distributing stress across its structure. This design is beneficial in improving crashworthiness, which is vital in auto collision repair and safety.

In contrast, other shapes such as square, T-shaped, and U-shaped have their applications and uses but do not offer the same combination of strength and impact resistance that the C-shaped frame design provides in full frames. For example, a square shape is less efficient in managing forces while a T-shape may not offer the same support and stability as required in a collision scenario.