Question

What is the radius of the circle whose equation is x^2 + y^2 = 8?

64?

Answer 1

standard form of equation of circle with center (a,b) and radius r is
\[\Large (x-a)^2+(y-b)^2=r^2\]
compare your equation with this to get answer!

Answer 2

hmmm 4?

Answer 3

What is square root of 8 ??

Answer 4

nopes! try again look that by comparing \[\Large r^2=8\]

Answer 5

2\[\sqrt{2}\]

Answer 6

YEs...

Answer 7

Well Done..