Question

What is the equation of a circle whose diameter is 6 cm?

Answer 1

Are you given the coordinates of the center of the circle?

Answer 2

No it just says that. Im assuming just to use (0,0) but I dont know because thats all that the question is.

Answer 3

Look at the attachment I posted above. (h,k) is standard for the coordinates of the center of a "mystery" circle.

Note that the formula gives the radius, not the diameter so you will have to adjust the 6.

Answer 4

x^2+y^2=3

Answer 5

Why would you assume this: Im assuming just to use (0,0)

Answer 6

This would be wrong because i dont have the radius?

Answer 7

>>>x^2+y^2=3 Wrong even if the center were (0,0) @chetan552

Answer 8

@shelbyv If you know the diameter, how do you get the radius of the circle?

Answer 9

So @Directrix what is the correct answer?

Answer 10

Are you saying that there is no diagram?

Just an out of the blue question: What is the equation of a circle whose diameter is 6 cm?

Answer 11

Radius is half of the diameter
and yes that is EXACTLY what im sayying.

Answer 12

\[(x-h)^2+(y-k)^2=9\]the center is not specified.

Answer 13

if the center is (0,0)\[x^2+y^2=9\]

Answer 14

@shelbyv

Then, find the equation of a circle with center (h,k) and radius 3.

(x - h ) ^2 + (y - k) ^2 = 3^2

is what I would put.

Do you have options?

Answer 15

nope no options at all. Just that question typed on a blank sheet of paper.

Answer 16

I would put that this and move on: (x - h ) ^2 + (y - k) ^2 = 3^2

Answer 17

Okay. thanks so much.

Answer 18

If that is said to be wrong, then defend it. You have all the "defense" in this thread.

Answer 19

Okay :)

Answer 20

Ya i said same radious=diameter/2 @Directrix