A regular octagon is a closed figure with sides of the same length and internal angles of the same size. It has eight lines of reflective symmetry and rotational symmetry of order 8. A regular octagon is represented by the Schlafli symbol (8). The internal angle at each vertex of a regular octagon is 135 ( 3 4 (\displaystyle \scriptstyle (
rac (3\pi )(4))) radians). The central angle is 45 ( 4 (\displaystyle \scriptstyle (
rac (\pi )(4))) radians).

Is the following statement correct based on the text

are all sides of an octagon the same size
yes