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### Course: 7th grade (Illustrative Mathematics)>Unit 1

Lesson 6: Lesson 7: Scale drawings

# Scale drawings

Sal finds a missing side length in a scale drawing when given either a set of corresponding side lengths or one side length and the scale factor.

## Want to join the conversation?

• This kind of feels over complicated, this is a very simple thing.
• I know right?! but it was still pretty helpful once i understood what they meant
• Sal knows math, but not chickens. That my friends, is a Rooster.
• belly laughs for infinity
• my name is Bella btw I need help, I'm only 12 and in 7th grade;-;
• Hi Bella! Maybe this can help:

A scale drawing is a drawing of an object that is larger or smaller than, but proportional to, the original object.

If the scale drawing is larger than the original object, then it is called an enlargement.

If the scale drawing is smaller than the original object, then it is called a reduction.

A scale is a ratio of a length in the drawing to the corresponding length in the actual object.

You can write a scale in three ways: as a ratio, as a fraction, or with an equal sign:

*drawing length : actual length

drawing length / actual length

drawing length = actual length

To find the scale used in a drawing or model, divide the drawing length by the actual length. Then write the ratio in simplest form.

Hope this helps!
• explain a little more about it
• I kinda get it but not much
• how do i solve it
• Could you also divide and get the same answer or does it have to be multiplied?
• try it yourself to see if it does work. both ways I mean.
• how do i sumbmit this?
• this was a little confusing at first
• But do you get it now? If not, I can help you.
• This question stumped me. I tried using every source of help I could find for this equation, and nothing. The question: The scale for the drawing of a rectangular playing field is 2 inches = 5 feet. Find an equation you can use to find the dimensions of the actual field. What are the actual dimensions? Btw, length is 20in and width is 10 in.
• you should make a proportion that says
2"/5'=20"/L' and another that says 2"/5'=10"/w'
"L" would equal 50' and "w" would equal 25'

key for symbols incase u don't understand what I said
" = inches
' = feet
L = length
w = width