Question

A hamster ball has a radius of 21 centimeters. What is its volume written in terms of π?

Answer 1

volume = 4/3 π r3

Answer 2

12,348π cm3
9,261π cm3
6,946π cm3
588π cm3

Answer 3

which one do you get?

Answer 4

How would i do it though? like what are the steps to ding it? I dont understand

Answer 5

how can you get volume with only two numbers? that would only be area?

Answer 6

thats what I am trying to figure out!!!

Answer 7

thats what I am trying to figure out!!!

Answer 8

how thick is that circle?

Answer 9

@countonme123 the volume is the formula above. @kenzi.sloboda.14 do you know the radius?

Answer 10

radius is 21cm

Answer 11

there are actually three numbers. Pi, 4/3, and the radius.

Answer 12

4/3 is pi,no?

Answer 13

so, then what is the radius squared?

Answer 14

no, Pi is 3.14 (approximately, anyway) however, they want the answer in terms of Pi.

Answer 15

oh my bad then teach me as well how to solve this i would like to learn

Answer 16

@countonme123 it is a pretty basic problem. they give you the radius of the sphere. you take the radius, square it, multiply it by 4/3, and then multiply that by Pi. almost as easy as determining the area of a circle.

Answer 17

oh ok so its a sphere? and why did you use 4/3

Answer 18

because just like the equation for the area of a rectangle is length times width (l*w), the equation for the volume of a sphere is 4/3 times radius squared times Pi. Google for 'volume of a sphere', you should see plenty of sites that offer this information.

Answer 19

\[21^{2}\times4/3\times3.14\]so its writn like ^

Answer 20

but they are asking for the answer in terms of Pi. you include Pi in the answer. take a look a the possible answers you posted above. each one has the Pi symbol in it. so this means that you only calculate the 21^2 x 4/3. and then show that number with Pi.

Answer 21

all of them have the pi symblom in them

Answer 22

yes, they do. which means after you multiply the radius squared by 4/3, you are done.

Answer 23

wait why is is 21 to the second power?

Answer 24

the radius is squared because that is how you determine the area of an circle inscribed within the sphere.

Answer 25

588 is the answer i think

Answer 26

It has a very long time since I have proven the formula for the area of sphere... so can't do that here.

Answer 27

oh man what grade is this?

Answer 28

@kenzi.sloboda.14 that's it!

Answer 29

I gotta go. good luck. I hope you understand the process.

Answer 30

what grade?

Answer 31

10th

Answer 32

ahh I see that's why I am not familiar with this work.I am in 9th.