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## Find the area of a convex polygon by decomposing it into triangles/rectangles. 0506.4.2

### Links verified on 9/15/2014

1. Convex Polygon - definition and an interactive polygon to experiment with
2. Creating Polygons - investigating the Concept of Triangle and the Properties of Polygons (from NCTM)
3. Identify Polygons - names of polygons by number of sides and angles - instruction and review, practice, and a quiz and
4. Name that Polygon - identify name of given polygon components - instruction and review, practice, and a quiz and
5. Polygon Playground - arrange designs with online movable polygons - hundreds of polygons to drag anywhere you want also
6. Making Triangles - investigating the Concept of Triangle and the Properties of Polygons (from NCTM)
7. Minimal Convex Polygon Decomposition - This applet demonstrates the Algorithm of Minimal Convex Polygon Decomposition, by using a dynamic programming approach to the problem.
8. Minimal Convex Polygon Decomposition Demo - an applet which will decompose a polygon into a minimal number of convex polygons
9. Pattern Blocks - This is a little program that lets you make geometrical patterns out of blocks. It's just like playing with wooden pattern blocks, but there is one big difference: a group command, which makes it much easier to build large patterns.
10. Separating Shapes - [8 page worksheet] shape decomposition exercises and possible solutions. [This expired link is available through the Wayback Machine Internet Archive. If the page doesn't load quickly click on Impatient? at the bottom right of the page.]
11. Shape Search - [8 page worksheet] problem sets and solutions for composing and decomposing simple geometric shapes [This expired link is available through the Wayback Machine Internet Archive. If the page doesn't load quickly click on Impatient? at the bottom right of the page.]
12. Shapes at Work - Purpose: To look for shapes in both the natural and designed world; to investigate the ways in which shapes can be used; to design and build structures using appropriate shapes
13. Triangle Identification - type of triangle, given its angles - instruction and review, practice, and a quiz and

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