#1
Im on the last stage of my maths coursework.

I need to find the area of a circle, only given the circumference.

C = 1000m

Area=Pi Radius Squared

Radius = C/Pi?

Can somebody please explain how to work out the area?
#2
i believe the formula is 2x3.14xRadius squared
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#3
Quote by jmilli2
You just explained how to work it out yourself..... ????



I got a result that was an anomoly.

I may be getting the brackets wrong on the calculator. Can somebody explain that part?
#6
Quote by haven222
When the hell will you ever use that in real life..



Right now when the deadline is tomorrow. Other than that, never.
#7
it's Pi x r squared.... you square the radius not the whole lot.
#8
here are the two formulas you need:

circumference = 2 x pi x radius
area = pi x (radius)squared

so divide circumference by 2pi, then square that, then multiply by one pi
#9
Circumference is Pi x Diameter

So C/Pi = D

D/2 is the radius, so square that and times by Pi and thats the answer
#10
Circumference = 2pr

1000 = 2 * 3.14... * r

r = 159.1549431

Area = pr²

3.14... * r²

Area = 79577.47155 meters²
#11
www.google.com

jebus.

basic maths like that is extremely useful.

even the RLY hard abstract pointless stuff has its uses....you'd be surprised
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#12
Thanks.

C=1000m

R=1000/Pi = 318.309
R = 159.15
159.15 squared = 25328.72
25328.72 * Pi = 79572.52

... i think i must have been using the diameter instead of radius

Thankyou.
#13
Circumference = 2 x PI x radius
1000= 2 x PI x radius
radius x PI = 1000/2 = 500
radius x PI = 500
radius = 500/PI = 159.15...

Area = PI x radius (squared)
Area = 3.142.. x (159.15) (squared)
Area = 79577.47155

is this the fencing crap?

edit: bollocks beaten to it

tip: make sure you don't waffle in the introduction and conclusion
#14
Quote by haven222
When the hell will you ever use that in real life..


The radius of a circle? I'm pretty sure there are "real life" applications for the area of a shape. I don't know what kind of job you plan on getting...
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#17
Leave the guy alone you haters. Maths doesn't come so easily to some people, and he needed help on it. He got the help, now the rest of you just leave him be OK.
The day will come when YOU need help with something and you won't expect this kind of treatment would you?
Now fuck off you idiots
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#19
Quote by BlackLuster
Leave the guy alone you haters. Maths doesn't come so easily to some people, and he needed help on it. He got the help, now the rest of you just leave him be OK.
The day will come when YOU need help with something and you won't expect this kind of treatment would you?
Now fuck off you idiots



corr, keep your panties on. most of us probably wouldn't ask the pit about something that really is very basic. and he's gotten help from loads of people, so he has nothing to complain about :p

but yeah, as simply as i can write it: area of a circle = pi(radius^2).

so you just square the radius, then multiply it by pi. voilá
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#20
Quote by handlerb
The radius of a circle? I'm pretty sure there are "real life" applications for the area of a shape. I don't know what kind of job you plan on getting...

When will you need to measure circles?!
#21
an easy way to remember is:

twinkle twinkle little star
circumference of a circle is 2 pi r

therefore, area must be pi r squared.


got me through my GCSE that did.
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#22
Quote by haven222
When will you need to measure circles?!



what if you wanted to build a tower? EH EH? if people start laying siege to your castle it might be useful to build a big ol' tower. and you'd need to know the interior measurements so you could order the right amount of carpet.
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#23
Quote by esther_mouse
what if you wanted to build a tower? EH EH? if people start laying siege to your castle it might be useful to build a big ol' tower. and you'd need to know the interior measurements so you could order the right amount of carpet.


Although they couldn't deliver the carpet through the siege blockade. You really need to think these things through.
#24
Quote by SmarterChild
Although they couldn't deliver the carpet through the siege blockade. You really need to think these things through.



if you built it in advance it wouldn't matter.

or, you could have it airlifted in.

or i, personally, would just get the peasants within my castle walls to weave me my bloody carpets. you think i'd let them live in my nice safe town for no payment?

edit: actually, i think carpet people should just have some sort of neutral stance in wars. they're too important to be killed!
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#25
Quote by esther_mouse
if you built it in advance it wouldn't matter.

or, you could have it airlifted in.

or i, personally, would just get the peasants within my castle walls to weave me my bloody carpets. you think i'd let them live in my nice safe town for no payment?

edit: actually, i think carpet people should just have some sort of neutral stance in wars. they're too important to be killed!


I think carpet people are neutral in wars. I've never actually heard of a carpet manufacturer declaring war on anything apart from other carpet companies.

But really, the best thing to do is just to build your castle behind a giant screen of hay bales so your enemies don't actually know it's there.
#26
Quote by haven222
When will you need to measure circles?!


doing anything that involves wheels or screws or holes or......
#27
C = 2piR
1000 = 2piR
500 = piR
500/pi = R

A = piR^2
A = pi(500/pi)^2
A = 79 577.4715

Wow, I I haven't done shapez in so long.
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Last edited by Muphin at Jan 28, 2008,
#28
Quote by haven222
When will you need to measure circles?!



He might go into the business of designing jam jars.
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#29
Quote by SmarterChild
I think carpet people are neutral in wars. I've never actually heard of a carpet manufacturer declaring war on anything apart from other carpet companies.

But really, the best thing to do is just to build your castle behind a giant screen of hay bales so your enemies don't actually know it's there.



that, my friend, is an ingenious plan.

i'll go nick some haybales immediately!

edit: knowing the size, circumference, radius, and area of the top of the haybales might come in useful for building the hay bale wall. and if they were those round ones...voila, practical application of maths!
MEMBER OF THE LAUGAM BRITISH HIT SQUAD! HONORARY MEMBER OF THE SWEDISH LAUGAM HIT SQUAD!
I'M JUST SEE THROUGH FADED, SUPER JADED, AND OUT OF MY MIND
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#30
Quote by esther_mouse
that, my friend, is an ingenious plan.

i'll go nick some haybales immediately!


It's not my plan. Some awesome guy did it already. http://www.dailymail.co.uk/pages/live/articles/news/news.html?in_article_id=510161&in_page_id=1770

It looks like he needed some knowledge of the area of circles to build his towers though. And this is a lesson to all those people who plan to build a mock-Tudor castle and then hide it with hay bales: Know your basic maths first!
Last edited by SmarterChild at Jan 28, 2008,
#31
Lol at you, idiot.
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