Question

Pleasee help!! I need the equation of a circle with a center at (0,0) and a radius of 5.

Also, an equation of a circle with a center of (0.0) and a diameter of 20.

And an equation of a circle with a center at (1,2) and a diameter of 15.

Answer 1

General equation of circle is \((x-h)^2 + (y-k)^2 = r^2\), where (h,k) is center of the circle and r is radius

Answer 2

so the first answer would be 25?? @geerky42

Answer 3

No, just subsitute (h,k) in the formula that geerky42 gave you

Answer 4

i cant crack it

Answer 5

but if h,k is (0,0)?

Answer 6

So, just subistute and you'll see.

Answer 7

2+2=5^2?

Answer 8

\[(x-h)^{2}+(y-k)^{2}=r^{2} where, h=0, k=0, r=5\]
Substitute thos values in the equation

Answer 9

so (x-0)^2 +(y-0)^2=5?

Answer 10

Yes!

Answer 11

and that is my equation?

Answer 12

Yes

Answer 13

that was really easy! THANK YOUU

Answer 14

Now do the same thing with the other two problems

Answer 15

No problem

Answer 16

wait @charliealbert what if I the problem only provides the center and the diameter?

Answer 17

What is the diameter?

Answer 18

center (0,0) and diameter 20