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LESSON 12-1

I can identify and use 3-dimensional figures

solidflat surfaces

polygons

surface

5 faces

segment2 faces

8 edges

intersection 2 or more

5 vertices

2parallelcongruent

2parallel congruent

1 basepoint

vertex

shape base(s)

Rectangular prism Pentagonal pyramid

Triangular prism Trapezoidal prism

Pentagonal prism Square pyramid

∆ABC , ABED, BEFC,ADFC∆DEF

AB BC CA DE EF FD BE CF ADA, B, C, D, E, F

ABCDE AB BC CA DE AF BF CF DF EFA, B, C, D, E, F

∆AEF , ∆EDF , ∆DCF , ∆CBF , ∆BAF EA

parallel basescircles

circularbase vertex

  

Cross Section   

 

o A cross section of a solid is the intersection of the solid with a

_____________________

  

 

plane

circleCross section = slice

Example 3: Identify the shape of the cross section of each solid.  a. b.

circletriangle

Example 4: Draw a cross section parallel to the base of each solid. Then identify its shape.

a. b.

square circle

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12-1 worksheet

ASSIGNMENT