Key Terms
What's Missing
Miscellaneous
That's Ratio
Scale That Factor
100
The number side lengths are multiplied by to get the side lengths of a similar shape.
What is the Scale Factor
100
Find the height of the tree, h.
16 ft
100
Original (x, y) Image (5x, 5y)
What is yes, similar. (Same SF applied)
100
Write a ratio of 15 boys to 12 girls
15 to 12
15/12
15:12
100
Scale factor of 2
200
The comparison of two things (ex: length to width)
What is a Ratio
200
2.5 cm
200
What copier size factor was used to create an image that is three times larger?
What is 300%?
200
A class has 12 students who like football and 5 who do not like football. Write a ratio of students who do not like football to those who like football.
5 to 12
200
Whats the Scale Factor?
1.5
300
Exactly the same shape and size
Congruent
300
The perimeter of the new shape after a triangle with perimeter 12 cm and area 8 cm2 is scaled up by 3.
What is a new perimeter of 36 cm?
300
Name what our current unit is called.
Stretching and Shrinking
300
Are the following ratios equivalent?
4:6 and 18:24
no
300
How does the Scale Factor affect the perimeter of a figure?
The perimeter changes by the scale factor.
400
These TWO things must be the same for shapes to be similar.
- shape
-Angles are equal
-Have a scale factor or equal ratios
400
The height of the building that casts a shadow of 8 feet, if a 4-foot student casts a shadow of 6 inches.
What is 64 feet tall?
400
When is our unit test?
Tuesday, June 8th
400
Write an equivalent ratio (proportion) to the ratio 4:5
8:10 or others
12:15
16:20
400
What is the scale factor from the shadow of the wall to the shadow of the tree?
4
500
TWO TERMS:
1. the sides in the same position on two different figures
2. sides next to each other on the same figure that share a vertex
Corresponding sides
Adjacent sides
500
The area of both triangles.
What is 17.5 square feet (small) and 70 square feet (large)?
500
When is the last day to turn in missing math assignments?
Today!
500
Write a ratio (length to width) that would help you solve the following two similar triangles.
21/x = 24/16
500
How does the Scale Factor affect the area of a figure?
The area changes by the scale factor times the scale factor or the scale factor squared. Example, if the scale factor is 3, the area changes by 9.