Scale Copies I
Scale Copies II
Scale Drawings
The Factor
100
What is a scaled copy?
A shape that is bigger or smaller than the original figure.
100
What are corresponding parts?
A point, segment, or angle in the same position but on a different figure.
100
What is a scale drawing?
An actual object that has been enlarged or reduced so that it can be shown on a piece of paper.
100
What is a scale factor?
The number that you multiplying the scale copy by to figure out the actual measurements
200
What are the two requirements for a scaled copy?
1) ALL distances/sides must be multiplied by the same number.
2) ALL of the angles must stay the same.
200
What is the corresponding part to point A and Point B?
Point E corresponds to Point A
Point F corresponds to Point B
200
A scale drawing of a school bus has a scale of 1 inches to 7 feet. If the length of the school bus is 3 inches on the scale drawing, what is the actual length of the bus?
The actual length of the bus is 21 feet.
Reasoning: The scale factor is 7 because
1 *7 = 7 so 3*7 = 21
200
A) What will happen to the shape when your scale factor is greater than 1?
Example: scale factor = 2
B) What will happen to the shape when your scale factor is less than 1?
Example: scale factor = 1/2
A) The scale copy will be bigger
B) The scale copy will be smaller
300
Is this a scaled copy?
Yes, it is!!
300
True or False: The measure of angle HEF is twice the measure of angle DAB. 
False
300
The scale of a map says that 4 cm represents 5 km. What distance on the map (in centimeters) represents an actual distance of 12.5 kilometers?
10 cm
300
Triangle ABC is pictured below. Draw a scale copy of the triangle with a scae factor of 1/2. (LABEL THE SIDE LENGTHS)
Side lengths of 2, 2,5, and 3.5.
400
The side lengths of triangle ABC are 3, 4, and 5. Triangle DEF is a scale copy of ABC. What are the potential side lengths of DEF? (Multiple answers)
Answers may vary. Must all be multiplied by the same number.
400
Rectangle A is 8 in by 2 in.
Select all of the measurements that would create scaled copies of Rectangle A.
A: 40 in by 10 in
B: 20 in by 5 in
C: 9 in by 3 in
D: 7 in by 1 in
E: 16 in by 4 in
Measurements A, B, and E.
400
A map of the local park is made with the scale 1 inch to 200 feet.
Find the actual measurements of the park.
The park is 1000 ft by 2400 ft
Reasoning: The scale factor is 200 so each side is multiplied by 200 .... but the length of the park has to be turned into inches first!!
400
Find the scale factor from ABCD to EFGH.
The scale factor is 2
500
Which one is not a scaled copy? Be ready to explain why.
Copy 3 is not a scaled copy because every side was not multiplied by the same scale factor.
500
There are two different scaled copies of a rectangle.
The scale of the first copy is 1cm = 10m.
The scale of the second copy is 1cm = 50m.
If the length of the rectangle is 15 cm on the first scale copy, how long will it be on the second?
The length on the second scaled copy would be 3cm.
Reasoning: On the first scale drawing ...
1cm = 10m so 15cm = 150m
That means on the second drawing
if 1cm = 50m then 150m would equal 3cm
500
Below is a scale drawing of a park. The drawing is 5 in wide by 7 in long. The actual park is 140 yards long. What is the area of the park?
14,000 square yards
500
Find the scale factor
The scale factor is 1.5