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**taylorn5683****Member**- Registered: 2017-02-01
- Posts: 7

What is the circumference of the circle if the radius is:

4. 3x-4

I tried and tired and there are no like terms so it wont work but my teacher says differant.

What is the radius if the circumference is:

6. 30x(pi)

radius is 4.8x

7. 4x-10pi

4x-31.4

8. (5/2)pi

1.24 Pi

9. 14pi

the radius is 2.2

10. (x + y)pi

PI x+PI y

she won't explain what is wrong or how to do it she says just use formula but I am confused with the variable I think.

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Hi taylorn5683,

Let's start with the formula for the circumference of a circle. If a circle has radius , then its circumference is . So, if a circle has radius , then it has circumference .So if a circle has radius , what must the circumference be?**LearnMathsFree: Videos on various topics.New: Integration Problem | Adding FractionsPopular: Continued Fractions | Metric Spaces | Duality**

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