the center of a circle is at (6,-7) and the diameter of a circle is 22. Which of the following is the equation of the cirlce/

Question

anonymous · Answer

Please write equations of circle here

anonymous · Answer

$$(x-h)^2+(y-k)^2=r^2.~~~(h,k)~~is~~center,~~~~r=radius$$

anonymous · Answer

a. (x-6)2 + (y+7)2=11
b.(x-6)2 + (y+7)2=11
c. (x+6)2 + (y-7)2=121
d. (x-6)2 +9y+7)2=121

anonymous · Answer

okay now we need to use above standard equation of circle 
Can you try to find out radius from diameter ?

anonymous · Answer

can you plug in your points into the formula I have posted ?

 

$\large\color{red}{ \bf      tip:	 }$    x--a=x+a

anonymous · Answer

Use radius = diameter / 2   and we are having diameter  = 22  so radius = --- ?

anonymous · Answer

im getting confused .. okay 6 is x and -7 is y? right

anonymous · Answer

Here we need to plug ( h , k )  ( 6 , -7 )   into equation of circle can you try ?