Find the equation of the circle in standard form for the given center (h, k) and radius r: (h, k)=(0,0), r=9

Step-by-step explanation:

The equation of circle ( in general form ) is  given  by :_

, where r= radius of the circle .

(h,k) = center of the circle .

Given : Center = (h,k)= (0,0)

Radius = r = 9 units

Then the equation of the circle will be :-

Hence, the required equation of the circle  =

it is a. 4.2 because 7.6-3.4 gets the remaining length of 4.2. i might be wrong but i am pretty sure this is the answer.