Answer: 1
Step-by-step explanation:
rewrite x^2 + y^2 -1 = 0 as x^2 + y^2 = 1
the 1 on the right hand side of the equation is equal to the radius squared
1 = r^2
r = 1
Answer:
radius = 1
x^2 + y^2 -1=0
Add 1 to each side
x^2 + y^2 -1+1=0+1
x^2+y^2 = 1
This is written in the form
(x-h)^2 + (y-k)^2 = 1^2 where (h,k) is the center and r is the radius
The center is (0,0) and the radius is 1
