Q: What is the centre and radius of a circle when x squared plus y squared -4x -2y -4 equals 0?

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The 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.

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

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

Related questions

The 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.

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

Area equals pi times the radius squared.

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.

Algebraically, it is ; - A = pi r^(2) In words, it is ' Area equals 'pi' multiplied to the radius squared'. NB 'pi' is a constant at 3.141592..... usually shortened to '3.14'. The radius (r) is the distance from the circle centre to the circumference/edge. 'radius squared' is r^(2) , that is 'r' multiplied to 'r' ; r X r = r^(2) . NNB The circumference of a circle is ; C = 2 pi r Note the power/exponent of '2' becomes a coefficient. In words ' Circumference equals two multiplied to 'pi' multiplied to the radius. (NOT 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

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.

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