Question

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

Explanation:

Step1: Recall regular polygon symmetry

A regular \( n \)-sided polygon has \( n \) reflectional symmetries.

Step2: Apply to decagon

A regular decagon has \( n = 10 \) sides, so it has 10 reflectional symmetries.

Answer:

The regular decagon has 10 reflectional symmetries, so the correct option (assuming the first option with 10 is the answer) is the one labeled "10" (e.g., if the options are A. 15, B. 10, C. 5, D. 20, then B. 10).