Question

The equation for the circle below is x2 + y2 = 25. What is the length of the circle's radius?

Answer 1

the radius is given
you just have to know how to compare that equation to the standard form equation of a circle
\[(x-h)^2+(y-k)^2=r^2\]
we have here that h and k are both 0
so let's right this a little different since we know that
\[x^2+y^2=r^2\]
r represents radius

Answer 2

comparing x^2+y^2=r^2 to x^2+y^2=25
what is 25?

Answer 3

the radius ?

Answer 4

r is the radius

Answer 5

what is 25

Answer 6

y=25

Answer 7

look and tried to compare these two equations

it should be clear to you what 25 is
25 is in the place of?