1. 

New Seats!
Intro to Stretching and Shrinking
› Mathematical Highlights
› Corresponding sides and angles

Work on tonight’s homework
› Pizzazz Worksheet page 130

4. 
How can you judge whether two objects
are similar?

They look alike and have the same
shape.

5. 
You probably use the word similar quite
a bit in everyday conversation. For
example, you might say that one song
sounds similar to another song or that
your friend’s bike is similar to yours.

Similar is also a mathematical word,
which is used to describe a type of
relationship between shapes.

6. 
Recognize similar figures visually and
identify that figures are similar by
comparing sides and angles.

Understand and use the equivalence of
ratios of sides to examine similar figures
and find unknown lengths.

7. 
Understand the relationship between
measures of lengths in figures and the
scale factor relating two similar figures.

Use the scale factor between figures to
scale a figure up or down and to predict
the lengths of corresponding edges and
areas.

Use the concept of similarity to solve
everyday problems.

8. WEEK 1: Quarter 2
Find a pair of
corresponding parts.
1.Side CA
2.Side CB
3.Angle D
4.Angle E

9. Please have your homework on your
desk and get started on your warm
up.
 Correct Pizzazz p. 130
 Investigation 1:Enlarging Figures
› 1.1 Stretching a figure (first test)
 Tonight’s homework
› Pizzazz worksheet p. 131


10. 
In this investigation, you will use rubber
bands to make enlargements of
drawings. Although this is not a precise
way to enlarge drawings, it’s fun- and
you can see some interesting
relationships between a figure and its
enlarged image.

11. 
As you work on this investigation, think
about these two questions:

When a figure is enlarged, which of its
features remain the same?

When a figure is enlarged, which of its
features change?

12. 
Michelle, Daphne,
and Max are the
officers of their
school’s Mystery
Book Club. Max
designed a flyer
inviting new
members to attend
the club’s next
meeting. (Read the
flyer.)

13. 
Daphne thought it would be a good
idea to make a large poster announcing
the meeting. She wanted to use the
detective figure from the flyer, but at a
larger size. Michelle showed her a clever
way to enlarge the figure by using
rubber bands.

16. 
Use your
stretcher to
enlarge the
figures on
Labsheets1.1
and 1.2

18. WEEK 1: Quarter 2
Find a pair of
corresponding parts
1. Side RH

2.
Side OL
3.
Define ratio
4.
Define scale factor

19. Please have your homework on
your desk and get started on your
warm up.
 Correct last night’s homework
 Work on

› Problem 1.1 (answer in your journal)

Homework
› Follow up 1.1

20. WEEK 1: Quarter 2

Compare the following objects

21. 




Please have your homework on your desk
and complete the warm up.
Discuss Follow up 1.1. Please write down
any answers that you do not have filled in.
Class Activity: 3 band stretcher with partners
Discuss Area of a circle
Tonight’s assignment
› Core Workbook p. 355 - 356

22. Area

23. Radius
Center
Diameter The diameter d is
twice the radius r.
d = 2r
Circumference

24. Remember!
Pi (π) is an irrational number that is often
approximated by the rational numbers 3.14
and 22 .
7

26. Welcome to Pre-Algebra Honors!
Friday
• Please have last night’s
homework on your desk and
your weekly assignment sheet.
• Correct core workbook p. 355 –
356
• Get started on Application 1
– What you do not finish is
homework