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

9 units

Center is at (5, 0)

Explanation:

The radius of the circle is equal to the square root of 81

`√(81)` = ±9

Since the radius of a circle must be positive the answer is 9 units.

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