1. Unit 9: Perimeter and area of plane figures Textbook: Chapter 11

2. Assingment Sheet

3. 11.3 Areas of Other Quadrilaterals

6. 11.4 Areas of Regular Polygons

7. A circle can be circumscribed about any regular polygon. The center of the circumscribed circle is the center of the regular polygon, and the radius of the circle is the radius of the regular polygon. Because the circumscribed circle contains each vertex of the polygon, the radius of a regular polygon must be a segment that joins the center with any of the vertices. The apothem of a regular polygon is the distance between the center and a side. A central angle of a regular polygon is an angle whose vertex is the center and whose sides contain two consecutive vertices of the polygon.

8. 11.4 Areas of Regular Polygons Important Terms

9. 11.4 Areas of Regular Polygons

10. 9