Question

Write the equation of a circle with a center at (0, 0) and a radius of 5.

Answer 1

The equation of a circle comes from the distance formula
\[r^2=(x-h)^2+(y-k)^2 \]
where (h,k) is the center and r is the radius

Answer 2

so it would be 5^2=(x-0)^2+(y-0)^2

Answer 3

wait no... x^2+y^2-25=0

Answer 4

yep that is right
both ways you wrote it is right

Answer 5

thank you!

Answer 6

np