## anonymous one year ago Cylinder A has a radius of 12 inches and a height of 6 inches. Cylinder B has a volume of 648π. What is the percent change in volume between cylinders A and B? Cylinder B is 50% smaller than cylinder A. Cylinder B is 25% smaller than cylinder A. Cylinder B is 150% bigger than cylinder A. Cylinder B is 200% bigger than cylinder A.

1. anonymous

find the volume of cylinder A

2. anonymous

3.14 * 12^2 *6 3.14 * 144 *6 2712.96

3. anonymous

yup, now find the volume of cylinder B

4. anonymous

then divide the bigger volume by the smaller volume

5. anonymous

then convert that decimal into a percent

6. anonymous

but how do i find the volume of cylinder B when i dont know the radius

7. anonymous

because it says the volume of cylinder B is 648 times pi

8. anonymous

648 * 3.14 + 2034.72

9. anonymous

no,volume of A$=\pi 12^2*6=864 \pi$ volume of B$=648 \pi$ change in volume$=864 \pi-648 \pi=216 \pi$ % change$=\frac{ 216 \pi }{ 864 \pi }\times 100=25 %$ =25 %

10. anonymous

how did you get the volume of A to be 864.. Im confused ? @surjithayer

11. anonymous

$v= \pi r^2 h$

12. anonymous

he/she didn't get 864, he/she got 864*pi

13. anonymous

Oh i see what you did now my bad(:

14. anonymous

do not substitute the value of pi as the volume of B is 648 pi.

15. anonymous

oh, never mind - listen to @surjithayer I might be wrong

16. anonymous

i am a man.

17. anonymous

I understand now, Thank you soooooo muchhh!!

18. anonymous

yw