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READY … SET … MATH !! . read until we begin. . Reminder…. Today is the last entry for your notebooks ! Be sure you go through your notebook assignment sheets and SELF-ASSESS that you have everything! If you can’t find it, then I can’t find it!

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ready set math

READY…SET…MATH!!

read until we begin. 

reminder
Reminder…
  • Today is the last entry for your notebooks! Be sure you go through your notebook assignment sheets and SELF-ASSESS that you have everything!
  • If you can’t find it, then I can’t find it!
  • Highlight the titles of your homework to make it easier to find.
  • Do you have your name, date, ACE #s on everything?
slide3

Make sure your notebook assignment sheet looks like this:

  • #. Date Brief Description_________________
  • 1. 10-3 S&S Problem 2.1 day 1/ ACE (1 a-f)
  • 10-4 S&S Problem 2.1 day 2/ ACE (14-15)
  • 10-5 S&S Problem 2.2 ACE 3, 16, 17
  • 10-6 S&S Problem 2.3 ACE 5,6
  • 10-11 S&S Problem 3.1 ACE 1-3, 22-25
  • 10-12 S&S Problem 3.2 ACE 4-6, 26-31
  • 10-13 S&S Problem 3.3 ACE 9-14, 38-41
  • 10-18 S&S Problem 4.1 ACE 1, 2,15-20

BIG IDEA: Similarity and Ratios

Book p. 58 You need: calculator

Lab sheet 4.1

think about it
Think about it…
  • How do you think this technique produced these variations of the original shape?
  • If we think of these images as we did the Wumps, which ones would be in the same family?
  • How would you know they were in the same family?
  • Are these similar figures?
  • These figures don’t have straight sides like the Wumps did. What can we measure to check for similarity?
what is a ratio
What is a “ratio”?
  • A comparison of two quantities by division
  • Examples…
  • Length to width
  • Cost per ounce
  • Height to weight
  • Can YOU think of more?
slide12

A new figure is created that is similar to the original girl. The height of the girl in this new figure is 15 cm. What is her width?

  • Could you use ratios?
  • If so, how?
  • Height10 = 15
  • Width8x
                  • Are there other ways to write the ratio?
what do we do today
What do we do today?
  • Today, you will find ratios of SHORT SIDE to LONG SIDE for each rectangle.
  • Then you will compare the information that the ratios and the scale factors give about similar figures.
time to get to work
TIME TO GET TO WORK!
  • Work with a partner to complete Problem 4.1 using your lab sheet
  • The BACK of your lab sheet is where you will write your answers today!
slide16

Ratio A = 3/5

Ratio B = 3/5

Ratio C = 3/5

Ratio D = 3/10

slide17

Equal Ratios mean similar figures.

Non-equal ratios

mean that the figures are not similar.

slide20

All ratios are equal.

Similar parallelograms are F & G.

For parallelograms to be similar, the ratios

AND the corresponding angles must be the same.

slide22

Make sure your notebook assignment sheet looks like this:

  • #. Date Brief Description_________________
  • 1. 10-3 S&S Problem 2.1 day 1/ ACE (1 a-f)
  • 10-4 S&S Problem 2.1 day 2/ ACE (14-15)
  • 10-5 S&S Problem 2.2 ACE 3, 16, 17
  • 10-6 S&S Problem 2.3 ACE 5,6
  • 10-11 S&S Problem 3.1 ACE 1-3, 22-25
  • 10-12 S&S Problem 3.2 ACE 4-6, 26-31
  • 10-13 S&S Problem 3.3 ACE 9-14, 38-41
  • 10-18 S&S Problem 4.1 ACE 1, 15-25
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