Question

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

Answer 1

The answer is 10. ten refelctions. 

Answer 2

Answer:- In a regular decagon, there are 10 reflectional symmetries.

Reflectional symmetry or Line of symmetry divides a figure into two equal halves so that if you flip the half image over the line of symmetry, the figure would look same.

A regular decagon has 10 vertices and 10 edges.

where 10 vertices forms 5 lines of symmetry.

and 10 edges forms 5 lines of symmetry.

⇒Total lines of symmetry in a decagon =5+5= 10

Thus, In a regular decagon, there are 10 reflectional symmetries.