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There is no direct ratio. The area is related to the square of the radius by the factor "pi."

A = (pi) r2

(Pi is about 3.1416)

Q: What is the ratio between radius and area for a circle?

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In a circle, the area of the circle is pi times the radius squared

It depends on the ratio of what of the circle? Its circumference, diameter, area?

1/3.15159

The answer depends on what the ratio is relative to!The ratio of a circumference to the area of a circle is half the radius.

The area of a circle is given by the formula A = πr2 where pi is the ratio of the circumference of a circle to its diameter and r is the radius. π = 3.1416 approx. A = π182 = 324π = 1017.88 in2 (2dp)

Related questions

By using the other information supplied about the circle to calculate either its radius (from which its area can be calculated) or its area (if the circle is similar to another with a given area and some ratio between the two circle is given):If the diameter is given: radius = diameter ÷ 2If the circumference is given: radius = circumference ÷ 2πIf the circle is similar to another circle which has a given area, and the length ratio is given; square the length ratio to get the area ratio and apply to the given area.

In a circle, the area of the circle is pi times the radius squared

It depends on the ratio of what of the circle? Its circumference, diameter, area?

The ratio of a circle's circumference to its area is called the reciprocal of half the radius. The ratio of the circumference to its radius is called two times pi.

Let's call the number 'K' ... the side of the square and the radius of the circle.-- the area of the square is [ K2 ]-- the area of the circle is [ (pi) K2 ]-- The ratio of the circle to the square is [(pi) K2 / K2 ] = pi

1/3.15159

The answer depends on what the ratio is relative to!The ratio of a circumference to the area of a circle is half the radius.

The radius of a circle and the area of a circle are directly proportionate. This is because the area of a circle is calculated by the formula: Area = pi * radius2. Since we are using the radius to find the area, there is an association between the two.

The relationship between the radius and area of a circle is as follows: Area of circle = 3.14 x Radius x Radius or 22/7 x Radius x Radius

Area(A)/ Area(B) = pi*rA2/pi*rB2 = rA2/rB2 = 16/81

In relation to the area of a circle: pi*radius^2

The area of a circle is directly proportional to the square of its radius. If two circles have radii R1 and R2 , then the ratio of their areas is ( R1/R2 )2