0
You need to think of that equation in terms of the classic definition of a circle:
(x - a)2 + (y - b)2 = r2
where a and b are the center of the circle, x and y are any point on it's circumference, and r is it's radius.
In the case of the circle you're looking at:
x2 + y2 = 16
You can re-express it like this:
(x - 0)2 + (y - 0)2 = 42
So that circle has a center at the point (0, 0), and a radius of 4.
Wiki User
∙ 14y ago
Add your answer:
Earn +20 pts
What is the equation for a circle with a center of (3 0) and a radius of 12?
(x-3)2+y2=144
This circle is centered at the origin and the length of its radius is 4 What is the equation of the circle?
x2 + y2= 16
What is the length of the circle radius if the circle is x2 plus y2 equals 1?
The center of the circle is at (0, 0) and its radius is the square root of 1 which is 1
The equation of the inner circle is x2 plus y2 equals 4 the radius of the outer circle is four times the radius of the inner circle write the equation of the outer circle?
The inner circle is x2 + y2 = 4. The radius of the inner circle is the square root of 4, which is 2. To find the radius of the outer circle, multiply 2 times 4. The radius of the outer circle is 8. Square 8 (82 or 8 x 8) to find the number to put into the equation of the outer circle. This is 64. The equation for the outer circle is x2 + y2 = 64.
What is the equation of a circle whose center is at the origin and whose radius is 10?
The equation of circle is (x−h)^2+(y−k)^2 = r^2, where h,k is the center of circle and r is the radius of circle. so, according to question center is origin and radius is 10, therefore, equation of circle is x^2 + y^2 = 100
Find the radius of a circle with the equation x2 plus y2 equals 16?
x2 +y2 = R2 =16 = radius 2 R = 4
Find the center of the radius x2 plus y2 equals 5?
Centre = (0,0), radius = sqrt(5)
Find the center and radius of x2 plus y2 equals 49?
Center is (0, 0) . . . the origin.Radius is 7.
What is the radius for a circle whose equation is x2 y2 16?
I think you have missed out an equals sign. If you mean x2 + y2 = 16, then the radius is 4.
What is the radius for a circle whose equation is x2 plus y2 16?
I think you have missed out an equals sign. If you mean x2 + y2 = 16, then the radius is 4.
Find the center and radius of the circle with this equation x2 plus y2 plus x equals 0?
x2+y2+4x+2y+3=0(x+2)2 + (Y+2.5)2 = 3This is the equation of circle with center at (-2,-2.5) with radius 3.5
The equation of a circle centered at the origin is x2 plus y2 16. What is the radius of the circle?
If that equals 16 then the radius is 4
What is the following equation if a circle whose center is at the origin and whose radius is SQ RT of 5?
x2 + y2 =x2 + y2 = 5x2 + y2 = 10x2 + y2 = 25
What is the equation for a circle with a center of 4 0 and a radius of 10?
(x - 4)2 + (y - 0)2 = 102 or x2 - 8x + 16 + y2 = 100 or x2 - 8x + y2 - 84 = 0
Which is the equation of the circle with its center at origin and radius 8?
x2 + y2 = 64
What equation of the circle with its center at the origin and radius 9?
x2 + y2 = 81
What is the equation for a circle with a center of 0 and a radius of 9?
x2 + y2 = 81
