# math

posted by .

x^2+y^2=36 is a circle. How can you tell without actually plotting? Where is the center?

• math -

The center placed in the point (0,0)

radius = sqrt ( 36 ) = 6

• math -

ya gotta know that

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

is the equation for a circle of radius r with center at (h,k)

## Similar Questions

1. ### math

-a circle with center at the point O(0,0) also has the point P(-2,3) on it. The equation of this circle is?
2. ### 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) …
3. ### Math

Circle O is centered at the origin and has a radius of 5. Circle O' is the image of circle O after a translation of T1,2. What is the center of circle O'?
4. ### DIT

Given the co-ordinates (x,y) of a center of a circle and it's radius. determine whether a point lies inside the circle or outside the circle?

Is 1,725+346 more or less than 2,000? Explain how you can tell without actually adding.
6. ### Equations of a Circle

Write the standard for of the equation of the circle that passes through the points at (0,8),(8,0),and (16,8). Then identify the center and radius of the circle. I have r=8, center=(8,8). What now?
7. ### 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 circle …
8. ### math

A circle has its center at the center of a square with 12-inch sides. Using 3.14 for pi, find the area of the square not covered by the circle, then write a ratio of the circle’s circumference to the perimeter of the square.
9. ### Geometry

A scientist is plotting the circular path of a particle on a coordinate plane for a lab experiment. The scientist knows the path is a perfect circle and that the particle starts at ordered pair (-5, -11). When the particle is halfway …
10. ### 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, 5.5 …

More Similar Questions