CK-12 Foundation
Ck 12: Geometry: Polygons Study Guide
[Free Registration/Login may be required to access all resource tools.] This study guide focuses on polygons: convex vs concave, interior and exterior angles, and basic terminology for common polygons.
Math Open Reference
Math Open Reference: Irregular Polygon
A complete reference guide to irregular polygons. It provides definitions and an interactive activity that enhances further explanation. Includes links to related topics.
CK-12 Foundation
Ck 12: Interactive Geometry: 1.3 Polygons
Explore the structure and measurement of polygons.
Other
Relationships: Dynamics
The dynamics of shape in art and the relationship of shape with the other elements of art. The effects of angles and lines on perception.
Ducksters
Ducksters: Physics for Kids: Lenses and Light
Kids learn about lenses and light in the science of physics including concave, convex, converging, diverging, focal point, meniscus, and Plano lenses.
ClassFlow
Class Flow: Polygons
[Free Registration/Login Required] This flipchart defines a polygon and the classification of concave and convex polygons.
Curated OER
Concave & Convex, 1955
This website, although mostly for selling artwork prints by M.C. Escher, provides a good picture of Escher's famous piece lithograph, "Convex and Concave." Includes some informative text.
Curated OER
World of Escher: Concave and Convex
This website, although mostly for selling artwork prints by M.C. Escher, provides a good picture of Escher's famous piece lithograph, "Convex and Concave." Includes some informative text.
Curated OER
World of Escher: Concave and Convex
This website, although mostly for selling artwork prints by M.C. Escher, provides a good picture of Escher's famous piece lithograph, "Convex and Concave." Includes some informative text.
Curated OER
World of Escher: Concave and Convex
This website, although mostly for selling artwork prints by M.C. Escher, provides a good picture of Escher's famous piece lithograph, "Convex and Concave." Includes some informative text.