Find an equation of the circle shown below.

A) (x + 10)2 + (y − 10)2 = 289

B) (x − 10)2 + (y − 10)2 = 289

C) (x − 10)2 + (y + 10)2 = 289

D) (x − 10)2 + (y − 10)2 = 17

Question

Find an equation of the circle shown below.

 
A) (x + 10)2 + (y − 10)2 = 289

B) (x − 10)2 + (y − 10)2 = 289

C) (x − 10)2 + (y + 10)2 = 289

D) (x − 10)2 + (y − 10)2 = 17

anonymous · Answer

attachment

anonymous · Answer

@bianey23 can you calculate the radius ?

anonymous · Answer

@bianey23 Come on you can do that, right ?

anonymous · Answer

Not really I dont understand

anonymous · Answer

ok @bianey23 the radius is 1/2 the distance

anonymous · Answer

the distance between tow points A(a,b) and B(c,d) is :
$$d(A,B)=\sqrt{(c-a)^2+(d-b)^2}$$

anonymous · Answer

apply it and calculate the distance of the circle then 1/2 of the distance = radius

anonymous · Answer

$$(x-h)^{2}+(y-k)^{2}=r ^{2}$$

anonymous · Answer

Good

anonymous · Answer

You are looking for h,k,r right ?

anonymous · Answer

no for x,y and r

anonymous · Answer

why do you need x and y they are variables.
i gave you the formula take a look you need h and r

anonymous · Answer

h and k sorry and r of course