Scale Factor
If a scale factor of 1/2 is applied to a polygon will the shape get bigger or smaller?
Smaller
TRUE or FALSE: A scaled copy can be smaller than the original.
True
Parts of two figures that match each other.
Corresponding parts
A side is 4 units long. Scale factor = 2. What is the new length?
8
You might see this person pushing a colorful cart around NYC in the summer. They sell shaved ice covered in flavored syrup. What are they selling?
Piragua
A square has side lengths of 5. A scale factor of 3 is applied to make a new copy. What are the new side lengths?
Original sides: 2 and 5. Copy sides: 6 and 15. Is it a scaled copy?
yes
A copy where all matching lengths change by the same amount through multiplication.
scaled copy
A rectangle is 2 by 6. Make a copy using a scale factor of 3. What are the new dimensions?
6x18
Before Netflix and streaming, people put a rectangular plastic tape into this machine to watch movies at home. What is the machine called?
VCR
A square with side lengths of 5 has been copied by a scale factor of 3. What is the new area?
225
Original sides: 3 and 7. Copy sides: 6 and 13. Is it a scaled copy? Explain.
No, because 3→6 is ×2, but 7→13 is not ×2
The number you multiply the original measurements by to get the copy.
Scale factor
An original side is 15. The copy is 5. What fractional scale factor was used?
1/3
Before Spotify and Apple Music, people carried this around to listen to shiny round discs with music on them. What is it?
CD Player
Original = 10. Copy = 4. Write and simplify the scale factor.
2/5
Jay says, “I added 4 to every side, so I made a scaled copy.” Is Jay's rule correct? Why or why not?
No, because scaled copies require the same multiplication factor, not adding the same amount
When a figure is stretched, squished, or twisted so it no longer keeps the same shape.
Distorted, or NOT SCALE
An original rectangle is 6 units by 9 units. A scaled copy has one side that is 24 units. What is the other side? Show how you know.
36
Before people could scan and email documents, this machine sent a copy of a paper to another machine through a telephone line. What is it?
Fax machine
One pair changes from 15 → 9. Another changes from 25 → 15. What is the scale factor?
3/5
Original: 4 and 9. Copy: 10 and 22.5. Are they scaled copies? Prove it using both pairs.
Yes, because 10/4 = 2.5 and 22.5/9 = 2.5.
What TWO math words complete this statement?
In a scaled copy, __________ parts must change by the same __________.
corresponding; scale factor
An original rectangle is 4 units by 7 units. A scaled copy has a width of 14 units. What is the missing length of the scaled copy? Explain how you know.
8
In the 1990s and early 2000s, people used this internet service to go online, chat with friends, and hear the famous words “You’ve got mail.” What was it?
AOL/ America Online