Take%20a%20protractor,%20graph%20paper%20and%20your%20calculator%20from%20the%20bookshelf.

1
Do Now

• Take a protractor, graph paper and your
  calculator from the bookshelf.
• Write two sentences about what it means for two
  polygons to be similar.
• Solve the following problem for w, x, y and z

2
Similar Polygons

• Continued

3
Announcements

• 11.1 Worksheet due tomorrow.
• No late work will be accepted this semester.
• Sign up calendar for Do Now will be passed
  around tomorrow.

4
Todays Objectives

• Develop a definition and an intuitive concept of
  similarity
• Define similar polygons
• Use the definition of similar polygons to solve
  problems
• Use problem solving skills

5
Scale Factor

• The number you multiply by a side length of one
  polygon to get the corresponding side length of a
  similar polygon.
• Doesnt change from one pair of corresponding
  sides to another in the same figure.
• Greater than 1 if youre going from smaller to
  larger.
• Less than 1 if youre going from larger to
  smaller.

6
Whats the scale factor?

• Between these two figures?
• From the first to the second?
• From the second to the first?

7
Dilations on a Coordinate Plane
8
Practice
9
Practice
10
Practice
11
Practice
12
Todays Objectives

• Develop a definition and an intuitive concept of
  similarity
• Define similar polygons
• Use the definition of similar polygons to solve
  problems
• Use problem solving skills

13
Exit Slip

• Find the missing side lengths. Explain.
• Determine whether or not the polygons are
  similar. Explain why or why not.