Since this is not my area of expertise, I searched Google under the key words "three methods of showing scale" to get these possible sources:
https://www.google.com/search?client=safari&rls=en&q=three+methods+of+showing+scale&ie=UTF-8&oe=UTF-8
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.
http://www.hackcollege.com/blog/2011/11/23/infographic-get-more-out-of-google.html
Don't just copy the material. Express the ideas in your own words. Although this will take more time and effort, you will learn more.
illustrate using examples the three methods of showing scale
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1 answer