Geometry

Question Analysis:
This question tests your ability to distinguish between regular and irregular polygons.
The main focus is on identifying the condition under which all interior angles are equal.

Key Concept Explanation:
A regular polygon has equal sides and equal angles.
Only regular polygons guarantee that all interior angles are the same.

Step-by-Step Solution:
A regular hexagon has 6 equal sides and 6 equal interior angles
All other shapes listed may have unequal angles
“Concave” and “irregular” specifically suggest unequal parts

Option Analysis:
A. Concave → has at least one angle greater than 180°
B. Regular hexagon → al...