1) The document provides notes from lesson 18 on polygons and similarity. It includes assignments due on October 9th and offers extra credit for signing a test. 2) Key concepts from the lesson are defined, including polygon, regular polygon, similar, congruent, and corresponding parts. Examples are worked through to illustrate these concepts. 3) Different shapes of polygons are listed from pentagons to heptagons to demonstrate increasing number of sides.

1. lesson 18.notebook October 05, 2012
Assignment:
1­­>Set 19 (odds) ­ Due Tuesday (10/9)
2­­>Test signed for extra credit??
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2. lesson 18.notebook October 05, 2012
Lesson 18 Warm­Up:
1) Find the unknown number: 1001 = 13
x
Which property is illustrated by the following equations:
2) 1/2 x 2/2 = 2/4
3) 1/2 x 2/1 = 1
4) Convert 3 16/7 to a mixed number.
5) Simplify: 2/5 x 2/5 x 2/5
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3. lesson 18.notebook October 05, 2012
Lesson 18:
*polygon ­ a closed, flat shape with straight sides
http://www.youtube.com/watch?v=TTrbT_SSD0U
*regular polygon ­ a polygon with all sides equal and all angles equal
*Look at page 122!
*similar ­ figures that are the same shape, but not necessarily the same size
*congruent ­ figures that are the same shape AND the same size
*corresponding parts ­ sides or angles of similar polygons that occupy the same
relative positions
*Look at page 123!
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4. lesson 18.notebook October 05, 2012
Examples ­ Lesson 18:
pg. 124
A) octagon
B) square
C) acute angle
D) Yes...they are the same shape ­ but not necessarily the same size
E) No
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5. lesson 18.notebook October 05, 2012
F)
pentagon­­>
hexagon­­>
heptagon­­>
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6. lesson 18.notebook October 05, 2012
G) angle B
H) equal in measure
I)
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7. lesson 18.notebook October 05, 2012
J) B ­ because it is not "closed"
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