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Similar Shapes
Vocabulary
Proportions
Scale Factors
Negatives
100
Name at least 3 characteristics of similar figures.
1. Same angle measurements 2. Same shape 3. Corresponding sides on similar figures increase or decrease by the same scale factor.
100
Have corresponding angles of equal measure and the ratios (scale factor) of each pair of corresponding sides are equivalent.
What is simlar figures
100
It is the missing numer to the proportion 2/3 = n/6
What is 4
100
I want to increase a picture by 150%. What is the scale factor?
Scale factor is 1.5
100
-35 - (-11)
-24
200
I have two rectangles. Rectangle A has a length of 3in and a width of 2 in. Rectangle B has a length of 4in and a width of 6in. Are the two rectangles similar? Why?
No because the width increases by 2 and the length does not increase by 2. They have different scale factors.
200
The number used to multiply the lengths of a figure to stretch or shrink it to a similar image.
What is scale factor
200
5 scoops of gummy bears are mixed with 4 scoops of pretzels to make a bag of trail mix. If I use 25 scoops of gummy bears, how many scoops of pretzels do I need.
20 scoops of pretzels
200
I want to reduce a picture by 75%. What is the scale factor?
Scale factor is .75 or 3/4
200
-90 * 3
-270
300
I have a rectangle that has a length of 8cm and a width of 4cm. Create a similar rectangle that is twice the size of the original rectangle.
Length would be 16cm and width would be 8cm.
300
A four sided figure
What is a quadrilateral
300
If three buses can carry 75 people. How many people can two buses carry.
50 people
300
I painted a picture that was 3in by 5in. I want to enlarge the picture to 6in by 10in. What percent should I put into the copier?
200%
300
What are the algorithms for multiplying and dividing positive and negative numbers?
- and - is + + and + is + + and - is -
400
I have two triangles A and B. Triangle B is 3 times as big as triangle A. How does the perimeters, areas, and angles compare?
Perimeter of Triangle B is 3 times as big. Area of Triangle B is 9 times as big. The angles in both triangles are the same measurements
400
Patterns of ploygons that fit together
What is a tessellation
400
What is the missing numer in the proportion 5/n = 15/24
n = 8
400
I took a family portrait that was 8in by 10in. I want to reduce the size to 2in by 2.5in. What percent should I put into the copier?
25%
400
11-38
-27
500
I have a rectangle. Rectangle A has a length of 16cm and a width of 8cm. I want to create a similar rectangle that is 1/4 the size of rectangle A. What is the new rectangles length and width?
Length is 4cm Width is 2cm
500
A figure you can use to make a larger similar version of the original.
What is a rep-tile
500
Two rectangles are similar. Rectangle A has a length of 8cm and a width of 6cm. Rectangle B has a length of n and a width of 9cm. What is the length of n?
n= 12
500
What is the rule for reducing similar figures? Hint: think about the scale factor
the scale factor has to be between 0 and 1.
500
-8/-40
5