Answer:
A regular polygon is a polygon in which all the sides are equal.
This is the matched list.
1 . A center of a regular polygon is the common center of its inscribed and circumscribed circles
2 . The radius of a regular polygon is the distance from the center of the polygon to a vertex.
3.An apothem of a regular polygon is the perpendicular distance from the center of the polygon to a side.
4. A central angle of a regular polygon is an angle whose vertex is the center of the polygon and whose sides contain consecutive vertices of the polygon.