Geometry

Question Analysis:
This question tests the understanding of default prism classification.
The main focus is on recognizing that most prisms are assumed to be right prisms.

Key Concept Explanation:
If not specified, prisms are considered right, meaning the lateral faces are perpendicular to the base.

Step-by-Step Solution:
“Right” is the default unless “oblique” is mentioned.
Curved surfaces = not a prism.
Irregular vs. regular refers to base shape, not angle orientation.

Option Analysis:
A: Base shap...