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so in this problem they give you the

pool right and they pretty much want to

know the rates okay so the one the two

things they we looked at was we said all

right we know that circumference is pi

times diameter or you could say a

circumference is pi times two rings

right so we don't know what artists all

right that's the radius or the diameter

we don't know that distance across the

only we don't know what the radius is

and since we don't know the race we're

not going to be able to figure out the

diameter pi is obviously our our

constant number and then circumference

is the only other number that we can

possibly use and do they tell us what

there's two conferences it's funny right

so it's 24 times pi so what i can do is

i can just plug in 24 and for c equals

pi times diameter and doesn't Matt you

know each one I could plug in fear so

now to solve for or you could even plug

in it for this one 24

click link in 24 times pi equals pi

times 2r well here not a solve for d

divided by pi so you get 24 equals your

diameter so that would be the distance

would be 24 but they're asking us for

what is the radius right well half of

the radius is going to be 2 12 however

if I use this formula you do the same

thing divided by PI so you get 24 equals

to R divided by 2 and armed equal 12

which is simple not exist yet