Question

Circle P has a radius of 8 units with center P at (2, -1). Which equation defines circle P?

Answer 1

standard eq for a circle is (x - h)^2 + (y-k)^2 = r^2
where (h,k) = center of the circle
r = radius.
just plug in the values and u'll get the eq.

Answer 2

64=(x-2)^2+(y+1)^2

Answer 3

thanks :)

Answer 4

r^2=y^2+x^2 is from Pythagoras