1. 11.4 Three Dimensional Figures

2. What we will learn Classify solids Describe cross sections
Sketch and describe solids of revolution

3. Needed vocab Polyhedron: solid that is bounded by polygons
Face: side of a polyhedron
Edge: line segment formed by the intersection of two faces
Vertex: where three or more edges meet
Cross section: intersection of a plane and the solid

4. Ex. 1 Classifying solids Tell if a polyhedron and name if yes
Prism – if both bases are congruent
Pyramid – if one base and goes to a point
Use base to name then add prism or pyramid
Rectangular prism
Hexagonal pyramid
Not a polyhedron

5. Ex. 2 describing cross sections
What is 2D shape formed by the cut?
a. hexagon
b. triangle
c. rectangle
d. circle
e. circle
f. trapezoid

6. Ex. 3 Tell what is formed
Tell what figure is formed and what is radius.
Because rotating about an axis, forms a round shape
7. cone, radius 3
8. cylinder, radius 6
9. sphere, radius 7