- By
**nasia** - Follow User

- 121 Views
- Uploaded on

Download Presentation
## PowerPoint Slideshow about ' Cones and Cylinders' - nasia

**An Image/Link below is provided (as is) to download presentation**

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript

### Cones and Cylinders

What is a Polyhedron?

The term refers to the number of faces.A square pyramid and triangular prism are both pentahedrons. Not as descriptive as prism or pyramid names.

Warm Up

- Review Answers to #7 on page 386

Practical Application

- Architects use a variety of 3-D figures, and combinations, or modifications of these figures in their designs. Certain figures are used in packaging because some figures require less surface area for the same amount of volume than others.

Important Terms

Cone – 3-D object with a base that’s a flat surface, an apex, and ALL points on the base connect to the apex by a line segment.

Right Circular Cone – Circular base and a line drawn through the apex

and the centre of the base

is perpendicular to the base.

Apex is highest point from

the base.

Oblique

- If the line drawn from the apex to the base does not form a right angle, the cone is called oblique.

Describing Cones or Pyramids

- Full descriptions include right or oblique as well as the name of it’s base.
Ex. Egyptian pyramids are right square pyramids

How would the faces of a right pentagonal pyramid be different from those of an oblique pentagonal pyryamid?

Cylinders

- Cylinder is a 3-D object with
parallel & congruent flat bases.

ALL corresponding points on

base connect by line

segments along the surface.

Symmetry

- Planes of Symmetry – cut the shape into two equal pieces.

Practice

- Page 408 #1,2,3a,b, 5, 6 (table for prism), 8

Download Presentation

Connecting to Server..