Question

Dentify the radius and the center of a circle whose equation is (x – 5)² + y² = 81.

The radius of the circle is units.
The center of the circle is at (, ).

Answer 1

Explanation:

General formula

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

where (h,k) center of circle whose radius r

applying the formula to our Q

(x – 5)² + y² = 81

(x – 5)² + (y-0)² = 9^2

---> center of circle (5,0)

---> radius is 9