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Converters Constants Calculator Analytical Geometry
Circle Vectors Straight Line Parabola Ellipse Hyperbola
Coordinate Geometry [Triangle] Coordinate Geometry [Quadrilateral]
Operations:
Intersection of two circles
Intersection of a circle and a straight line
Equation of circumcircle of a triangle
Image of a circle
Equation of incircle of a triangle
Equation of excircles of a triangle
Equation of common chord of two circles
Parametric Equation of Circle
Chord of Contact of Circle

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OPERATIONS:

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Intersection of two circles
Intersection of a circle and a straight line
Equation of circumcircle of a triangle
Image of a circle
Equation of incircle of a triangle
Equation of excircles of a triangle
Equation of common chord of two circles
Parametric Equation of Circle
Chord of Contact of Circle
General Info
In Polar Coordinates
From two end-points of the diameter
Passing through three points
Touching both the axes
Passing through the origin
Touching a tangent and passing through a point
Passing through Intersecting point of two circles and another point
Passing through Intersecting point of circle and a straight line and another point
Chord Bisected at a Point
Having a center and a tangent

dialogs

Equation of a circle passing through the origin

Input the required data of the circle.

In case of inputting square roots, press the square root button and activate it. To insert fractions, insert it converting into decimals. For example, \(\frac{3}{4}\) is to be inputted as \(0.75\). But the output will be in decimals. Again, for working with more irrational numbers like \(2+\sqrt3\), you must input it in decimal form using full-stop \((.)\) as the decimal point.

A circle passing through the origin must satisfy the condition $$c=0$$

A circle passing through the origin touching the X-axis must have it's center on the Y-axis, in the format of: $$(0,r)$$ where r is the radius of the circle. Input the radius of the circle:






Theory [Equation of a circle passing through the origin]


A circle passing through the origin has its parameter \(c=0\). Alongside, it may be centered on X axis, or the Y axis, or it might be arbitrary. Being centered on X-axis and touching the origin actually refers to touching the Y axis, leading to $$f^2-c=0\Rightarrow f^2=c.$$ On the contrary, being centered on Y-axis and touching the origin actually refers to touching the X-axis, leading to $$g^2-c=0\Rightarrow g^2=c.$$ Finally, a circle having center \((g,f)\) usually, have the equation: $$(x-g)^2+(y-f)^2=g^2+f^2$$

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