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# Exploring scale copies

Sal uses virtual manipulatives to identify figures that scale proportionally.

## Want to join the conversation?

• i need help because this is very hard
• The scale copy increases from all sides but if it is not increasing from all sides that means it not a scales copy
• Did I just watch a Kahn video by myself NO
• Yes I believe so unless you are in class or someone is watching you!
• who needs reddit when you have the comment section of a khan academy video.
• what are scaled copies
• Scaled copies are a bigger version of a shape. I.E, if I have a polygon that has a perimeter of...10(length is 5 width is 2) and I want to scale it by 2, my new perimeter should be 40, because 5*2= 10 and 2*2= 4, 4*10= 40.
• i dont understand
• If someone could please provide me a real-life example of this that would be much appreciated!
• Pretend you are buying a decoration. You can choose to buy it 3 inches by 6 inches or pay \$3 extra to buy it 4 inches by 8 inches.
The sizes would be a scale copy. The measurements are both multiplyed by 4/3 if you pay more money.
Here is a challenge.
1. If the cost was proportional with the size, what would the measurements be for one that cost \$6 extra?
Answer: 5 inches by 10 inches
• i dont know what to ask