The number side lengths are multiplied by to get the side lengths of a similar shape.
What is the Scale Factor
Find the height of the tree, h.
16 ft
Original (x, y) Image (5x, 5y)
What is yes, similar. (Same SF applied)
Write a ratio of 15 boys to 12 girls
15 to 12
15/12
15:12
Scale factor of 2
The comparison of two things (ex: length to width)
What is a Ratio
2.5 cm
What copier size factor was used to create an image that is three times larger?
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
Whats the Scale Factor?
1.5
Exactly the same shape and size
Congruent
_____________ and ______________ are two methods that can be used to find missing side lengths of similar figures.
Scale factor and ratios
Name what our current unit is called.
Stretching and Shrinking
Are the following ratios equivalent?
4:6 and 18:24
no
How does the Scale Factor affect the perimeter of a figure?
The perimeter changes by the scale factor.
What must be true for shapes to be similar?
- shape
-Angles are equal
-Have a scale factor or equal ratios
The _________ method helps us find heights of objects that are difficult to measure directly.
When is our unit test?
Tuesday, June 8th
Write an equivalent ratio (proportion) to the ratio 4:5
8:10 or others
12:15
16:20
What is the scale factor from the shadow of the wall to the shadow of the tree?
4
Describe how the terms corresponding sides and adjacent sides are different
Corresponding sides are the sides in the same position on two different figures
Adjacent sides are next to each other on the same figure and share a vertex
Use the picture to find the height of the tree.
10 ft
When is the last day to turn in missing math assignments?
Today!
Write a ratio (length to width) that would help you solve the following two similar triangles.
21/x = 24/16
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.