Scale Factor
Scale Copy
Corresponding
Multiplication
Division
100
What is a scale drawing?
A drawing that shows a real object with accurate sizes reduced or enlarged by a certain amo
unt
100
What is the scale factor?
1
100
What is the corresponding side of side AC?
Side DF
100
5 x 8
40
100
15/5
3
200
What is a scale factor?
The ratio that you get when you divide corresponding side lengths of a similar figure.
200
What is the scale factor?
6/4=1.5
200
What's the corresponding angle for angle ABC?
Angle DEF
200
7 X 3
21
200
14/10
1.4
300
A rectangle that is 2 inches by 3 inches has been scaled by a factor of 7. What are the side lengths of the scaled copy?
14 & 21
300
The scale factor from ABC to DEF is 3.
Angle ABC has an angle of 20 degrees.
What is the angle measure of the corresponding angle?
20 degrees.
The angle size does not change regardless of the scale factor.
300
What is the corresponding angle to angle ACB?
Angle XZY
300
62 x 1/2
31
300
645/(1/2)
1290
400
A photograph measuring 4 inches wide, and 5 inches long is enlarged to make a wall mural. If the mural is 12 inches wide, how long is the mural?
What is 15 inches?
400
The scale factor from ABC to DEF is 3. What is the scale factor from DEF to ABC?
1/3
400
TRUE or FALSE
When two shapes are similar, then:
1. corresponding angles are equal
2. corresponding lines are in proportion
TRUE
400
87 x 98
8,526
400
625/25
25
500
Formula for Scale Factor
What is New/Copy over Original?
500
Here is a polygon on a grid. You need to find a scaled copy of this polygon that has a perimeter of 48 units. What is the scale factor?
Step 1: Find the perimeter of the shape below.
Step 2: How do you get from the perimeter of the original shape below to a perimeter of 48 units.
3
500
Triangle DEF is a scale copy of triangle ABC with a scale factor of 2.5. Segment AB has a measurement of 6 inches. This is the measurement of segment DE.
15
500
907 x 308
279,356
500
19038/2
9,519