what is the area of circule?

Answer 1

A = π r²

Answer 2

The symbol is π called pi and is approximately equal to 22/7 or 3.141592654 , most high school teachers use it to two decimal places as 3.14
π is the ratio between the circumference and the diameter of a circle ..i.e
π = (circumference / diameter ).
Interestingly the value of π is the same for any circle ...

Area of circle = π x ( radius x radius ) = π radius2

if the Radius = R
then
Area of circle = π R2 = π x R x R

Answer 3

The Area Of a Circle

[1] Finding the Area of a circle given the radius of the circle..

Definition : The radius of a circle is a straight-line drawn from the center of the circle to any point on its circumference .
The symbol p is called pi and is approximately equal to 22/7 or 3.141592654 , most high school teachers use it to two decimal places as 3.14
p is the ratio between the circumference and the diameter of a circle ..i.e
p = (circumference / diameter ).
Interestingly the value of p is the same for any circle ...

Area of circle = p x ( radius x radius ) = p radius2

if the Radius = R
then
Area of circle = pR2 = p x R x R



EXAMPLE (1) Find the area of the circle with radius 10 cm ..use p as 3.14
Answer
Here we have :
Radius = 10 cm
p = 3.14

Using the formula Area of circle = p radius2 = p x radius x radius

replacing radius with 10 cm and p with 3.14 in above formula we have

Area of circle = p radius2 = p x radius x radius = 3.14 x 10cm x 10cm = 3.14 x 100 cm2 = 314 cm2




[2] Finding the Area of a circle given the Diameter of the circle..


Definition : The diameter of a circle is a straight-line passing through the center of the circle touching the circumference of the circle at any two points..

Look at the figures immediately above , look at the half way mark of diameter (center of circle) in figure(3) do you see 2 radi (radi is the plural of radius)..,If you take the radius (R) in figure(1) and the radius (R) in figure(2) and put them together ,without any over-lapping ,they will form the diameter of as shown in figure(3)..(Note : all of the cirles above are of the same size.)
Hence ,
The diameter = radius + radius = 2 radi.

Let R = radius
so that
diameter = 2R
or , 2R = diameter
dividing both sides by 2 , solving for R
gives ;
R = (diameter)/2

so, radius = (diameter)/2

To find the area of a circle given its diameter :
Step [1] - find the radius by dividing the diameter by 2 ,i.e radius = diameter/2
Step[2] - now that you have found the radius (in step [1] ) use the formula above
( Area of circle = p radius2 = p x radius x radius )
and you are done..


Alternatively you can use the diameter directly, with the formula derived below
We have shown above that
radius = (diameter)/2
since radius = (diameter)/2 ,we can replace radius with (diameter)/2 in the formula ,
Area of circle = p radius2 = p x radius x radius
which gives :
Area of circle = p radius2 = p x radius x radius = p x (diameter/2) X (diameter/2)
i.e :
Area of circle = (p x diameter2)/4
= (p x diameter x diameter ) / 4

Answer 4

What is a circule? Sounds like it may be something in the metropolitan area?

Answer 5

the part within its line. it may be figured with the math formula
Pi ( 3.14 X the distance from the middle to the outside line, times itself ( squared) this is approximate.}

the old joke is: PI R Square ( no pie are round, cornbread are square)

Answer 6

pi times the square of the radius

Answer 7

pi times r square

Answer 8

Something about a square pie I think. I just hope it's chocolate cream. =0)~

Answer 9

pi times (radius squared)

Answer 10

pi*r*r

that's 3.1416*the radius of the circle*the radius of the circle