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Exploring Shapes and Polyhedrons: Unit 4 Vocabulary and Definitions

Learn about polygons, polyhedrons, nets, and basic shapes like rectangles, circles, and polygons in this unit. Discover regular prisms, pyramids, and dodecagons. Practice tracing nets, calculating surface area, and finding volume.

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Exploring Shapes and Polyhedrons: Unit 4 Vocabulary and Definitions

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  1. Unit 4: Shapes and Space Ms Cormier April 23rd, 2010

  2. Vocabulary/ Definitions • Polygon: a closed shape made up of line segments Ex. Triangles, rectangles • Polyhedron: an object that the faces are polygons • Net: a pattern that can be folded to make an object. • Regular prism: has regular polygons as bases that are parallel to each other, the other faces are rectangular. • Regular pyramid: has a regular polygon as a base, and triangles for the faces. • Regular dodecagon: is a polygon with 12 equal sides and equal angles.

  3. Outcomes/ Goals for this unit: • 4.1- 4.2 Trace or draw a net for a polyhedron. • 4.3, 4.4, 4.7 Find the total surface area of a polyhedron. • 4.5, 4.6, 4.8 Develop and apply formulas to find the volume.

  4. Basic shapes • Basic shapes are used to form polyhedrons. Rectangle Circle Square Polygons Triangle

  5. Names of other polygons Heptagon 7 sides Pentagon 5 sides Hexagon 6 sides Octagon Decagon 10 sides Dodecagon 12 sides

  6. Rectangular prism • 4 faces are rectangles • 2 bases are squares or smaller rectangles

  7. Pyramids and their bases -Pyramids are named by the bases they have. Ex: A rectangular pyramid has a rectangle for a base. What would be the name of the bases of these other pyramids? How many sides does each of these bases have?

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