Question

a regular decagon has 10 sides. how many reflectional symmetries does a regular decagon have? 5 10 15 20

Explanation:

Step1: Recall symmetry property of regular polygon

A regular $n$-sided polygon has $n$ lines of reflectional symmetry.

Step2: Identify value of n

Here, $n = 10$ for a decagon.

Answer:

B. 10