CIRCLE HELP!!!

[MAliCiOuSViCiOuz]

THE DIAMETER OF A CIRCLE IS 16 KILOMETERS. FIND THE AREA OF THE CIRCLE.



HOW DO YOU FIND THAT OUT?? PLEASE HELP ME! THANK YOU! I HAVE BEEN STRUGGLING WITH THIS PROBLEM!
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[stapel]

Recall that the radius r is half of the diameter, and plug the radius into the area formula they gave you: "A = (pi)(r²)".

Eliz.

 

[dark-kitsune]

Right!!! As stapel said.

So,...
16/2=8.

8 x 3.1428 will equal the area of the circle.

figure it ouT!!!

 

[dark-kitsune]

and square it .sorry!

 

[dark-kitsune]

sory. what i meant ro say was, 8 times 3.1428 and then square the total. got it?? my bad. sory if i confused u

 

[tkhunny]

Wow, I'm confused.

Let's see, Area of a Circle = [pi]*r²

Diameter = 16 km
Radius = Diameter/2 = 16 km / 2 = 8 km <== Notice the units.

Area = [pi]*(8 km)² = [pi]*64 km² <== Notice the units.

If you need a decimal value, let your calculator tell you what [pi] is. I get about 201.062 km²

P.S. Did you notice the units?

 

[dark-kitsune]

So then,

16/2=8

8²=64

then (pi)(64)= 201.06 rounded to the nearest tenth.

 

[dark-kitsune]

im right, right? :?: :?

 

[Gene]

Dai jobu desu. Despite all the help.
----------------
Gene

 

[dark-kitsune]

what the heck does that mean???
:?:

 

[Gene]

It means your screen name fooled me and you are right.
-----------------
Gene

 

[dark-kitsune]

oh.

 

[tkhunny]

(pi)(64)= 201.06 rounded to the nearest tenth.

Still, no.

1) Where are your units?
2) "nearest tenth"? Better count that again.

Who posted this problem, anyway?

 

[Denis]

My head is sadly shaking to the tune of "boy oh boy"...

 

[dark-kitsune]

my bad then.