Geometry

Question Analysis

This question focuses on testing the knowledge of the number of sides of a specific regular polygon, namely the dodecagon.

 

Key Concept Explanation

Regular Polygons: These are closed - plane figures with all sides and angles equal. The number of sides is a key feature that differentiates one type of regular polygon from another. The naming of regular polygons often follows Greek or Latin roots indicating the number of sides.

 

Step - by - Step Solution

The term "dodecagon" is derived from the Greek words "dodeka" meaning twelve and "gonia" meaning angle. So, a dodecagon has 12 sides by definition.

 

Option Analysis

A.8: A polygon with 8 sides is an octagon, not a dodecagon, so this option is incorrect.

B.9: A polygon with 9 sides is a nonagon, not a dodecagon, so this option is wrong.

C.10: A polygon with 10 sides is a decagon, not a dodecagon, so this is incorrect.

D.12: This is the correct answer as a dodecagon has 12 sides.

 

Common Mistakes

Confusing the names and side counts of different polygons, especially those with simil...