Question

Graph x2 + y2 = 9. What are its lines of symmetry?

Answer 1

hint:

\[\Large x^2 + y^2 = r^2\]

Answer 2

so is every liine through the center a line of symmetry?

Answer 3

yes that is correct. Why is that? What figure does this equation graph?

Answer 4

its either

Answer 5

What is the center of \[\Large x^2 + y^2 = 9\]

Answer 6

and what is the radius of \[\Large x^2 + y^2 = 9\]

Answer 7

is it the big circle or the little circle?

Answer 8

Look at the first hint he gave you. Look at that equation and then look at the 9.

Answer 9

what is the radius of \[\Large x^2 + y^2 = 9\]

Answer 10

keep in mind it is in the form \[\Large x^2 + y^2 = r^2\]

Answer 11

so its the little circle?

Answer 12

what radius did you get?

Answer 13

3?

Answer 14

correct

Answer 15

Yes the radius is 3. You're right it is the little circle because if you look it's radius is 3. Good job =D