Transcript BELL WORK

BELL WORK
6
3
A
5
2
R
9
B
C
5
4
6
S
10
T
7.5
6
6
List the pairs of similar shapes. What is the scale factor
to get from the smaller shape to the larger shape?
Open your books to Stretching and Shrinking, Page 58.
NOTES REVIEW
 Scale
Factor – the number used to multiply the lengths
of a figure to stretch or shrink it to a similar image.
 Original
Side Lengths x Scale Factor = New Side
Lengths
 Original
Perimeter x Scale Factor = New Perimeter
 Original
Area x Scale Factor Squared = New Area
UNIT 4 – SIMILARITY AND
RATIOS
UNIT 4 – SIMILARITY AND RATIOS
Original Image
Here are examples of the image after it has been
resized.
UNIT 4 – SIMILARITY AND RATIOS
Original Image
Here are examples of the image after it has been
resized.
UNIT 4 – SIMILARITY AND RATIOS
Simplify what
you can.
5 to 4
1 to 2
UNIT 4 – SIMILARITY AND RATIOS
UNIT 4.1 RATIOS WITHIN SIMILAR
PARALLELOGRAMS
UNIT 4.1 RATIOS WITHIN SIMILAR
PARALLELOGRAMS
12 or 3
20
5
9 or 3
15
5
6 or 3
10
5
6 or 3
20
10
UNIT 4.1 RATIOS WITH SIMILAR PARALLELOGRAMS
UNIT 4.1 RATIOS WITH SIMILAR PARALLELOGRAMS
10 or 5
8
4
7.5 or 5
6
4
6 or 5
4.8
4
Parallelograms F and G are similar.
Parallelogram E is not similar to the other two.
UNIT 4.1 RATIOS WITH SIMILAR PARALLELOGRAMS
All ratios of long side to short side equal 5/4
No. You must also check the corresponding
angle measures to see if they are congruent.
UNIT 4.2 RATIOS WITHIN SIMILAR TRIANGLES
UNIT 4.2 RATIOS WITHIN SIMILAR TRIANGLES
Identify the triangles that are
similar to each other.
Explain how you use the
angles and sides to identify
the similar triangles.
Triangles A, C and D are similar
UNIT 4.2 RATIOS WITHIN SIMILAR TRIANGLES
Within each triangle, find the
ratio of the shortest side to
the longest side. Find the
ratio of the shortest side to
the “middle” side.
UNIT 4.2 RATIOS WITHIN SIMILAR TRIANGLES
The ratios of corresponding side lengths of similar
triangles are equal.
You will usually get non-equivalent ratios for non-similar
triangles.
However, for some non-similar triangles some of the
corresponding ratios, but not all, may be equivalent.
EXIT SLIP
Triangle A
Triangle B
Triangle C
 Use
angle measures and ratios between side
lengths to determine which triangles are similar.