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How do you find the radius from this info? Or lack thereof
A = pi*r^2 36 = 3.14*r^2 solve for r to get r = ??? once you know the value of r, you can find the circumference C C = 2*pi*r
But how do you find R? Thats where Im stuck
the question wants the circumference function in pi... so we can get the relation
did you divide both sides of 36 = 3.14*r^2 by 3.14 ?
what do you get when you do so
Well 36/3.14 is 11.46
now if r^2 = 11.46, then what must r be?
What does ^ mean?
r^2 means r squared
r^2 = r*r
for example, 5^2 = 5*5 = 25
So multiply 11.46 by 11.46?
Wait, no. 5.73 multiplies by 5.73?
some number, multiplied by itself, gives 11.46
to find this number, you take the square root of 11.46
it turns out that sqrt(11.46) = 3.385 roughly which means 3.385*3.385 = 11.458225, pretty close to 11.46
So then i have 36=3.14*3.38^2?
now use that r value to find the circumference C use C = 2*pi*r
So two times pi times 3.38?
2 times pi times 3.38
oh sry didn't see your two, nvm
yes you are correct
21.23 is what I got.
Question: does the original "36" given in the problem also have a "pi" attached to it?
ok so that changes things a bit
if the area is A = 36pi, then A = pi*r^2 36pi = pi*r^2 36 = r^2 ... the pi terms cancel if r^2 = 36, then r = ??
yes, then you plug that into C = 2*pi*r
notice how each answer has a 'pi' in it so ignore the pi for now compute 2*r and then tack on 'pi' at the end
example: if r = 7, then 2*pi*r = 14pi
Im still getting the same thing.
you should get 12pi
2 times R which is 6 means 12. Then 12*pi. The answer I'm getting is still 37.69
2*r = 2*6 = 12
you leave it as 12pi
Thank you so much! Sorry I am so bad at this!
whenever you see the key term "exact" that means to leave the 'pi's as they are
you did good
Oh. Sounds good. Thank you that means a lot!