Question

What is the radius of the circle who’s equation is x^2 + y^2 = 9

Answer 1

Answer:

r=3

Step-by-step explanation:

• The equation of a circumference is $(x-a)^2+(y-b)^2=r^2$.
• Then , in this case $r^2=9$, and then to know the value of r we just simply have to calculate the square root of 9, which is 3.