Math Calculators, Lessons and Formulas

It is time to solve your math problem

mathportal.org

Circle equation calculator

This calculator can find the center and radius of a circle given its equation in standard or general form. Also, it can find equation of a circle given its center and radius. The calculator will generate a step by step explanations and circle graph.

Circle equation calculator
( circle equation ⇒ center and radius )
show help ↓↓ examples ↓↓
Hide graph
Hide steps
Find approximate solution
Circle equation calculator
( center and radius ⇒ circle equation )
show help ↓↓ examples ↓↓

Find the equation of a circle in form, with a center at $~C~\Large($ , $~ \Large) ~$

and $~P~\Large($ , $~ \Large) ~$ .

Hide graph
Hide steps
Find approximate solution
working...
examples
example 1:ex 1:
Find the center and the radius of the circle $(x - 3)^2 + (y + 2)^2 = 16$
example 2:ex 2:
Find the center and the radius of the circle $x^2 + y^2 + 2x - 3y - \frac{3}{4} = 0$
example 3:ex 3:
Find the equation of a circle in standard form, with a center at $C(-3,4)$ and passing through the point $P(1,2)$.
example 4:ex 4:
Find the equation of a circle in standard form, with a center at $C \left(\frac{1}{2}, -\frac{3}{2} \right)$ and a radius of $r = 5$.
Search our database of more than 200 calculators