## What is the general equation of a circle?

EQUATION OF A CIRCLE. 2) The general form : x2 + y2 + Dx + Ey + F = 0, where D, E, F are constants. If the equation of a circle is in the standard form, we can easily identify the center of the circle, (h, k), and the radius, r . Note: The radius, r, is always positive.

## What are all the formulas for a circle?

Formulas Related to Circles

Diameter of a Circle D = 2 × r
Circumference of a Circle C = 2 × π × r
Area of a Circle A = π × r2

## How do you find the center of a circle equation?

To find the equation of a circle when you know the radius and centre, use the formula ( x − a ) 2 + ( y − b ) 2 = r 2 , where represents the centre of the circle, and.

## How do you tell if an equation is a circle?

If they are, then these characteristics are as follows:Circle. When x and y are both squared and the coefficients on them are the same — including the sign. Parabola. When either x or y is squared — not both. Ellipse. When x and y are both squared and the coefficients are positive but different. Hyperbola.

## How do I calculate the area of a circle?

The area of a circle is pi times the radius squared (A = π r²).

## How do you write the standard form of a circle?

The standard form of a circle’s equation is (x-h)² + (y-k)² = r² where (h,k) is the center and r is the radius. To convert an equation to standard form, you can always complete the square separately in x and y.

## What is the circle in math?

Definition: A circle is the locus of all points equidistant from a central point. Definitions Related to Circles. arc: a curved line that is part of the circumference of a circle. chord: a line segment within a circle that touches 2 points on the circle. circumference: the distance around the circle.

## How do you find the equation of a line?

The equation of a line is typically written as y=mx+b where m is the slope and b is the y-intercept.

## How do you work out the equation of a line?

The general equation of a straight line is y = mx + c, where m is the gradient, and y = c is the value where the line cuts the y-axis. This number c is called the intercept on the y-axis.

## How do you find the radius of a circle with an equation?

The center-radius form of the circle equation is in the format (x – h)2 + (y – k)2 = r2, with the center being at the point (h, k) and the radius being “r”. This form of the equation is helpful, since you can easily find the center and the radius.

## Is a circle a function?

A circle is a set of points in the plane. A function is a mapping from one set to another, so they’re completely different kinds of things, and a circle cannot be a function.

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