Definitions
What's Missing
Corresponding Sides
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
Triangle ABC is similar to triangle GHI. Which side corresponds to side BC?
side HI
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
Rectangle DEFG is similar to Rectangle MNOP. Which side corresponds to side DE?
side MN
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
A map uses the scale 1 inch: 7 miles. The distance on the map is 5 inches. What is the actual distance represented by the map?
You must use the correct units!
35 miles
300
Parallelogram TUVW is similar to parallelogram CDEF. Which side corresponds to side CF?
side TW
300
A scale model of a boat uses a scale of 1inch: 2 feet. What is the actual size of the boat if the model boat is 20 inches long?
You must use the correct units!
40 feet
300
How does the Scale Factor affect the perimeter of a figure?
The perimeter changes by the scale factor.
400
What must be true for shapes to be similar?
- shape
-Angles are equal
-Have a scale factor or equal ratios
400
The _________ method helps us find heights of objects that are difficult to measure directly.
shadow
400
When is our unit test?
Thursday
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
Describe corresponding sides
Corresponding sides are the sides in the same position on two different figures
500
Use the picture to find the height of the tree.
10 ft
500
Daily Double! ΔPQR is similar to ΔSTU What side corresponds to side UT?
ΔRQ
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.