In this lesson our instructor talks about polygons. First she discusses what is a polygon, convex polygon, and concave polygon. The she talks about regular polygon, interior angle sum theorem, and exterior angle sum theorem. Four complete extra example videos round up this lesson.
Polygon: A close figure formed by coplanar segments such that the sides are non-collinear, and each side intersects exactly two other sides at their endpoints
Know the difference between a convex and concave polygon
Regular polygon: A convex polygon with all sides congruent and all angles congruent
The sum of the angle measures of a triangle is 180 degrees
The sum of the angle measures of a quadrilateral is 360 degrees
To find the interior angle sum of a polygon, use S = 180(n -2)
Exterior Angle Sum Theorem: If a polygon is convex, then the sum of the measures of the exterior angles, one at each vertex, is 360 degrees
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.