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Equation: x^2 +y^2 -4x -2y -4 = 0

Completing the squares: (x-2)^2 +(y-1)^2 -4-1-4 = 0

So: (x-2)^2 +(y-1)^2 = 9

Therefore the centre of the circle is at (2, 1) and its radius is 3

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0You need to change the equation to the form (x - a) squared + (y - b) squared = r squared. You do this by completing the square. In this case, (a, b) will be the center of the circle, and r will be the radius.

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0The centre is (a, a) and the radius is a*sqrt(2).

The equation describes a circle with its centre at the origin and radius = âˆš13. Each and every point on that circle is a solution.

Area equals pi times the radius squared.

The area of a circle is defined by the equation A = πr^2 where π = pi (3.14...) A = Area r^2 = radius squared So, the radius of a circle squared multiplied by pi equals the area.

area equals pi r squared therefor r squared equals area over pi. Now find square root of r squared and you have "R" (radius) = 2.821

Pi (3.14) times the radius of a circle squared, equals the circumference of a circle.

x2+y2-4x-6y-3 = 0 Using the appropriate formula it works out as:- Centre of circle: (2, 3) Radius of circle: 4.

A= Area of the circle¶= Pi (About 3.14)r= Radius squared (Radius times radius)3.14 * Radius squared

Area of a circle equals pi (3.14) times the radius squared.

Area of a circle is: pi times radius squared

The graph is a circle with a radius of 6, centered at the origin.

The radius of a circle that has an area of 64ft squared is: 4.514 feet.

Area of a circle equals pi (~3.14) multiplied by the radius squared. So to find the area of that circle your equation is (3.14)(3)^2 which equals approximately 27.

It is the radius of the circle.

The equation for a circle of radius r and centre (h, k) is: (x - h)² + (y - k)² = r² If the centre is the origin, the centre point is (0, 0), thus h = k = 0, and this becomes: x² + y² = r²

Centre = (0,0), the origin; radius = 11

If 0.8cm is the radius (distance from the centre to the edge of the circle) of the circle, the area of the circle is 2.010619298 cm squared. If 0.8cm is the diameter (distance from one side of the circle to the other), the circle's area is 0.5026548246cm squared.

The radius of a circle with an area of 35 mm squared is 3.34mm

The graph is a circle with a radius of 6, centered at the origin

Equation of a circle centre the origin is: x2 + y2 = radius2 ⇒ radius = √9 = 3.

You will get pi since area of a circle equals pi* times radius squared....by Mona Martinez

General formula for a circle is X squared + Y squared = radius squared. So the answer would be x squared + y squared = 2.64575131 squared

The radius of a circle is the distance from the centre of the circle to its circumference - which is the outer limit of the circle.

Area of a circle = pi*radius squared

If: x^2+y^2 -4x -2y -4 = 0 Then by completing the squares of x and y: (x-2)^2+(y-1)^2 = 9 Therefore the centre of the circle is at (2, 1) and its radius is 3 units

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