Question

The center of a circle is (2,1) and the coordinates of a point on the circle are (7,13). What is the equation of the circle?

Answer 1

@SolomonZelman plz help me

Answer 2

@campbell_st plz help me

Answer 3

@jdoe0001 plz help me

Answer 4

hmm let me see

Answer 5

i just need an answer thats it

Answer 6

can you see what the "radius" of that circle is?

Answer 7

its 13

Answer 8

find the distance from the centre to the point on the circle... that will be the radius

the general form is

\[(x - h)^2 + (y - k)^2 = r^2\]

the centre is (h, k) and the radius is r.

subsitute your centre h = 2 and k = 1

and then your calculated value of r...

hope it helps

Answer 9

so find the distance between those 2 points as campbell_st pointed out
get the radius, and plug it in the equation as shown above :)

Answer 10

thx

Answer 11

13 is the radius, well done