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# What is the scale factor if 21 and 12?

Updated: 9/24/2023

Wiki User

10y ago

It is: 21/12 = 7/4

Wiki User

10y ago

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Q: What is the scale factor if 21 and 12?
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### Common factor of 12 and 21?

CF of 12 and 21 is 3.

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The highest common factor of the numbers 12 and 21 is 3.

### What is the scale factor of spheres with a radius of 12 and 4?

Assuming the smaller sphere is the image of the larger sphere after transformation (based on the order of the radii): the scale factor is 4/12 = 1/3

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3 is a prime factor of 12 and of 21.

It is: 3 to 2

It is: 2 to 3

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The O'Reilly Factor - 1996 2012-12-21 was released on: USA: 21 December 2012

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