# Algebra ll

The center of a circle is at (-5 , 1) and it has a radius of 9. What is the equation of the circle?

A.(x-5)^2+(y+1)^2= 81

B.(x-5)^2+(y+1)^2= 3

C.(x+5)^2+(y-1)^2= 81

D.(x+5)^2+(y-1)^2= 3

1. 👍 0
2. 👎 0
3. 👁 111
1. (x - a)^2 + (y-b)^2 = r^2
for circle of radius r and center at (a,b)

1. 👍 0
2. 👎 0
posted by Damon
2. so this is c?

1. 👍 0
2. 👎 0
posted by Me and I
3. yes

1. 👍 0
2. 👎 0
posted by Damon
4. thank you, Damon :)

1. 👍 0
2. 👎 0
posted by Me and I
5. You are welcome.

1. 👍 0
2. 👎 0
posted by Damon

## Similar Questions

1. ### Math

I have a question my brother asked me but I need a math expert. You have two interlocking circles and the radius of circle B goes through the center of circle A and of course the radius of circle A goes through the center of

asked by DrBob222 on June 25, 2013
2. ### Geometry

Write the General form equations for the following circles: 1. A circle with center (1, -6) and radius 4 2. A circle with center (6, 8) and radius 10 3. A circle with center (0, 3) and radius 2√3 4. A circle with center (-0.5,

asked by Its me again on June 13, 2017
3. ### Geometry

I have a circle with a Tangent line, DE, running along it and connecting with another line, FC, which runs through the center of the circle to the other side.I have connected the center of the circle with point E on the edge of

asked by Aaron on June 3, 2009
4. ### Geometry

I have a circle with a Tangent line, DE, running along it and connecting with another line, FC, which runs through the center of the circle to the other side.I have connected the center of the circle with point E on the edge of

asked by Aaron on June 3, 2009
5. ### sir steve reiny damon bob maths help steve!!!

Point P(2,1) and Q(4,-5) lie on a circle. If line 2x-y-13=0 is a tangent to the circle at Q, what is (*) Coordinates of the center of the circle; (*) Equation of the circle. (*) Sketch out your circle. Step

asked by yourim on April 28, 2017
1. ### Geometry

2 circles with centers O and O' are drawn to intersect each other at points A and B. Center O of one circle lies on the circumference of the other circle. CD is drawn tangent to the circle with center O' at A. Prove that OA

asked by Shanu on January 17, 2015
2. ### Probability

Terminology: A circle of radius r is a curve that consists of all points at distance r from the center of the circle. A disk of radius r is the set of all points whose distance from its center is less than or equal to r . Thus, a

asked by No One on November 18, 2018
3. ### Math

The points (4, –5) and (– 4, 1) are endpoints of a diameter of a circle. (a) Find the center of the circle. (b) Find the length of the radius of the circle. (Note that this is a distance.) Give the exact answer. Show work. (c)

asked by Kate on June 24, 2009
4. ### science

A thin non-conducting rod is bent to form the arc of a circle of radius a and subtends an angle at the center of the circle. A total charge q is spread uniformly along its length. Find the electric field at the center of the

asked by supansa on September 6, 2016
5. ### physics

A thin non-conducting rod is bent to form the arc of a circle of radius a and subtends an angle at the center of the circle. A total charge q is spread uniformly along its length. Find the electric field at the center of the

asked by Supansa on September 6, 2016
6. ### physics

An object, after being released from its circular path, travels the distance OA in the same time it would have moved from O to P on the circle. The speed of the object on and off the circle remains constant at the same value.

asked by Mary on February 21, 2007

More Similar Questions