1.6 Two Dimensional Figures Concave If any of the lines that contain each side is extended and – goes through the inside. Convex If none of the lines that contain each side is extended and – never pass through the interior. Names of Polygons Number of Sides Type (Name) of Polygon 3 Triangle 4 Quadrilateral 5 Pentagon 6 Hexagon 7 Heptagon 8 Octagon 9 Nonagon 10 Decagon 12 Dodecagon N n-gon Equilateral, Equiangular, and Regular Equilateral All sides are equal. – Equiangular All angles are equal. – Regular All sides and angles are equal. It would be both – Equilateral and Equiangular. Perimeter The sum of the lengths of the sides of a polygon. – Circumference The distance around a circle. – Area The number of square units needed to cover a surface. –
1.6 Two Dimensional Figures Concave – If any of the lines that contain each side is extended and goes through the inside. Convex – If none of the lines that contain each side is extended and never pass through the interior. Names of Polygons Number of Sides Type (Name) of Polygon 3 Triangle 4 Quadrilateral 5 Pentagon 6 Hexagon 7 Heptagon 8 Octagon 9 Nonagon 10 Decagon 12 Dodecagon N n-gon Equilateral, Equiangular, and Regular Equilateral – All sides are equal. Equiangular – All angles are equal. Regular – All sides and angles are equal. It would be both Equilateral and Equiangular. Perimeter – The sum of the lengths of the sides of a polygon. Circumference – The distance around a circle. Area – The number of square units needed to cover a surface.
Chapter%201%20Notes.docx