A regular decagon has 10 sides. A decagon has 10 equal sides.

How many reflectional symmetries does a regular decagon have?

5
10
15
20

The zhou dynasty (1046-256 bce) was the longest-lasting of china's dynasties. it followed the shang dynasty (c. 1600-1046 bce) and it finished when the army of the state of qin captured the city of chengzhou in 256 bce.