Question

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

Answer 1

Rewrite in standard form to find the center and radius r .

( h , k )

Center:

( 5 , 0 )

Radius:

9

Answer 2

Answer:The radius of the circle is 9 units.

The center of the circle is at (5, 0).