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

The radius of the circle is
The center of the circle is at (1
units.

User Sviklim
by
8.7k points

2 Answers

1 vote

Answer:

The center is (5,0) and r=9.

Explanation:

The standard form of a circle is
(x-h)^2+(y-k)^2 where (h,k) is the center and r is the radius.

On comparing your equation of


(x - 5)^2 + (y-0)^2 = 9^2, we should see that h=5,k=0, and r=9.

The center is (5,0) and r=9.

User Estrella
by
8.2k points
6 votes

Answer:

The center is at (5,0) and the radius is 9

Explanation:

(x - 5)^2 + y^2 = 81.

An equation for a circle can be written in the form

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

Where (h,k) is the center and r is the radius

Rewriting the equation

(x - 5)^2 + y^2 = 81.

(x - 5)^2 + (y-0)^2 = 9^2

The center is at (5,0) and the radius is 9

User Bruno Ribeiro
by
8.8k points

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