## mrs.perkins 3 years ago If the radius of a circle is multiplied by 4, then how many times larger is the circumference of the new circle?

1. Monkeyball

The circumference of a circle is given by $2*\pi*r$

2. Monkeyball

and lets say we pick r=1 we get $2*\pi$

3. Monkeyball

now lets say that we multiply the radius by 4 so now r=4

4. Monkeyball

$8*\pi$

5. Monkeyball

8 pi is 4 times bigger than 2 pi

6. mrs.perkins

7. Monkeyball

Look at my last post

8. mrs.perkins

so what do i do next

9. mrs.perkins

so is 32

10. Monkeyball

wait can you tell me what the original radius equals?

11. mrs.perkins

i really dont know

12. Champs