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## PowerPoint Slideshow about ' Figures in 3 Dimensions' - althea

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20 equilateral triangles

Octagonal prism

Square antiprism

Dodecahedron (regular)

Cuboctahedron

Stellated dodecahedron

Isosidodecahedron (quasiregular)

Elongated pentagonal cupola

Definitions

- 2-D figure
- Closed
- All lines are straight

Polygon

Polyhedron

- 3-D figure
- Closed
- All faces are flat with straight edges

Classification

- How many faces does it have?
- How many vertices does it have?
- How many edges does each face have? (Can there be more than one type of polygon for a face?)
- Are there any concavity?
- Does it create a recognizable shape?

Classification

Requirements for your classification:

1. Classify at least sixteen different 3-D shapes

2. For each one, include its the name and a best-effort drawing

3. Include at least 4 levels of classification (vertical)

Animals

Mammals

Reptiles

Insects

Land

Aquatic

Classification not complete!!!

Dog

Cat

Whale

Classification

Requirements for your classification (continued):

4. Include at least 6 different categories (horizontal)

5. For each category, also write the criteria that a shape must meet to fit that category

Animals

Mammals:

Fur, warm-blooded

Reptiles:

No fur, cold-blooded

Insects:

Six legs, exoskeleton

Rodents:

Use teeth to gnaw, wide field of vision

Carnivores:

Large, predators, eat other animals

Aquatic:

Live underwater, feed on plankton and/or fish

Classification

Requirements for your classification:

Classify at least sixteen different 3-D shapes

For each one, include its the name and a best-effort drawing

Include at least 4 levels of classification (vertical)

Include at least 6 different categories (horizontal)

For each category, also write the criteria that a shape must meet to fit that category

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