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math 112 b 02/24/2016 - 02/29/2016

by: amber weiss

math 112 b 02/24/2016 - 02/29/2016 Math 112b Sec 004

amber weiss
GPA 3.7

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About this Document

Here is a condensed form of the notes on blackboard. The solutions and examples are posted on Blackboard so check them out there!
elementary mathmatics
cheryl eames
Class Notes
Math 112b
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This 2 page Class Notes was uploaded by amber weiss on Monday February 29, 2016. The Class Notes belongs to Math 112b Sec 004 at Southern Illinois University Edwardsville taught by cheryl eames in Spring 2016. Since its upload, it has received 24 views. For similar materials see elementary mathmatics in Mathmatics at Southern Illinois University Edwardsville.

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Date Created: 02/29/16
Chapter 9 Section 3 SNOW DAY PRESENTATION 02/24/2016 Chapter 9 Section 3 Terminology:  Space- is an undefined term (like point, line and plane)  Dihedral angle- angle formed when 2 planes meet  Parallel- if the line doesn’t intersect the plane  Perpendicular- if the line if intersects and is perpendicular to EVERY point in plane  Two planes are parallel if they do not intersect  Two planes are perpendicular if dihedral angle measures 90 degrees  Polyhedral- figures in space whose sides are polygonal regions  Faces- polygonal regions or sides  Edges- 2 faces intersect  Vertices- 3 or more faces intersect  Tetrahedron- 4 triangles for faces  Cube- 6 square faces  Octahedron- with 8 triangular faces  Dodecahedron- 12 pentagon faces  Icosahedron- 20 triangular faces  Semiregular polyhedral- polyhedral whose faces are 2 or more regular polygons with the same arrangement of polygons around each vertex  Pyramid- polyhedron with a polygon base and triangles as sides  Right pyramid- pyramid whose sides are all isosceles triangles  Prism- polyhedron with 2 parallel and congruent bases  Cone- circular base and a lateral surface that slopes to the vertex  Cylinder- 2 parallel circular bases of same size and a lateral surface that joins to bases  Net- 2 dimensional pattern for a three dimensional figure Name Faces Vertices edges Triangular prism 5 6 9 Triangular pyramid 4 4 6 Cube 6 8 12 Square pyramid 5 5 8 Hexagonal prism 8 12 18 Hexagonal pyramid 7 7 12 octahedron 8 6 12  Euler’s Formula- FACES + VERTICES = (E+2) add 2 more edges The worked out solutions are already given to us on blackboard in the notes!!! DOWLOAD THEM Chapter 9 Section 4 02/29/2016 Chapter 9 Section 4 Terminology: Reflection symmetry- when it is folded in half on a line of symmetry Line of symmetry- 2 images are congruent and line up on top of each other (mirror/reflection) Rotation symmetry- if it can be turned about a point less than 360 degrees and coincide with itself


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