## How do you find the equation of a circle given two points and radius?

If two points on the circle are given as (x1,y1) and (x2,y2) along with radius as r, simply substitute the values in the general equation and solve for g & h. We get values of (g,h) ,i.e, the coordinates of centre of circle. Put it in general equation of circle to get required equation of circle.

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

The formula for the equation of a circle is (x – h)2+ (y – k)2 = r2, where (h, k) represents the coordinates of the center of the circle, and r represents the radius of the circle. If a circle is tangent to the x-axis at (3,0), this means it touches the x-axis at that point.

## 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 equation of a circle?

First you need to know that the equation for a circle is (x-a)^2 + (y-b)^2 = r^2 where the center is at point (a,b) and the radius is r. so for instance (x-2)^2 + (y-3)^2 = 4 would have the center at (2,3) and have a radius of 2 since 4 = 2^2.

### Releated

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