how find the area of a circle when given the circumference?

Answer 1

there isn't a direct formula for that, but there are for circumference and area... it's in yuor maths book. why don't you check it out before coming here to ask stupid questions?

Circumference = 2.Pi.R
Area = Pi.R²

do the maths yourself: replace R in the 2nd equation by it's value from the 1st equation. solved

Answer 2

Area of a circle = pi*r*r,where r=radius
Circumferenceof a circle=C=pi*D,where pi=3.14 and
D=Diameter
C=pi*2*r
SO,r=C/pi*2
put this value of r in the formula for area of a circle.YOU WILL GET THE ANSWER.
Note:
(The distance around a circle is called its circumference. The distance across a circle through its center is called its diameter. We use the Greek letter (pronounced Pi) to represent the ratio of the circumference of a circle to the diameter. The formula for circumference of a circle is:C=pi*D . For simplicity, we use pi= 3.14. We know that the diameter of a circle is twice as long as the radius. This relationship is expressed in the following formula: D=2*r)

Answer 3

Take circumference and solve for diamter:

C = pi*d

d = C / pi


Next, find the radius by dividing diameter by 2:

r = d/2 = C / 2*pi

Use the radius expression in the area formula:

A = pi * r^2 = pi * (C / 2*pi)^2
=pi * (C^2 / 4*pi^2)
= C^2 / 4*pi

Answer 4

First find the radius, then find the area.

How to do it?

Let the radius of the circle be r.

2 * pi * r = circumference
r = circumference / (2 * pi)

Find r and plug in r into this equation:

pi * r * r = area of circle.

Answer 5

since the circumference=2 pie r and since you have the circumference then divide it by 2 then divide by pie (which is 22 over 7) then you will get the radius then the area =2 pie and times the squaring of the radius you will get it

Answer 6

Let circumference = C

So, 2*pi*r = C

So, r = C/(2*pi)

Area = pi*r*r = C*C/(4*pi)

Answer 7

C=2pir
r=C/2pi
Area=pi*r^2
=pi(C/2pi)^2=C^2/4pi

Answer 8

Cicumfrence c = pi x diameter = pi x d = pi x (2 x radius) = pi x 2r
r = c/(2 x pi)
Area = pi x radius squared = pi x r^2 = pi x (c/(2 x pi))^2 = pi x c^2/(4 x pi^2) =
c^2/(4 x pi)

Answer 9

I can't believe you don't know this, either you have just landed on earth or trying to make a fool out of people trying so hard to make you understand.
Try putting in some good questions that you can't work out. A little mental exercise will help you in the long run.

STUDY HARD

Answer 10

F-22, the formula is C^2/4*pi, where pi=3.14159......