## mrs.perkins Group Title If the radius of a circle is multiplied by 4, then how many times larger is the circumference of the new circle? 2 years ago 2 years ago

1. Monkeyball Group Title

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

2. Monkeyball Group Title

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

3. Monkeyball Group Title

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

4. Monkeyball Group Title

$8*\pi$

5. Monkeyball Group Title

8 pi is 4 times bigger than 2 pi

6. mrs.perkins Group Title

7. Monkeyball Group Title

Look at my last post

8. mrs.perkins Group Title

so what do i do next

9. mrs.perkins Group Title

so is 32

10. Monkeyball Group Title

wait can you tell me what the original radius equals?

11. mrs.perkins Group Title

i really dont know

12. Champs Group Title