Question

an equation of circle with centre (0,0) and radius r is ​

Answer 1

Answer:

x²+y²=r²

Step-by-step explanation:

(x-h)²+(y-k)²=r²

actual formula

(h,k)=(0,0) according to your question

r is radius

Answer 2

Equation of the circle, $x^2+y^2 = r^2$.

To find :

Equation of the circle = ?

Given

An equation of circle with centre (0,0) and radius r.

Equation of the circle, $(x-h)^{2}+(y-k)^{2}=r^{2}$

From the equation, (h, k) is the centre.

                                 r is the radius.

(h, k) = (0, 0)

Hence, the value of  h = 0 and k = 0.

Substituting, the given values in the equation gives,

            $(x-h)^{2}+(y-k)^{2}=r^{2}$

           $(x-0)^{2}+ (y-0)^{2} = r^2$

              $x^2+y^2 = r^2$

Thus, the equation of the circle is  $x^2+y^2 = r^2$.

To learn more...

1. brainly.in/question/14384563

2. brainly.in/question/14757760