M3 TOD 1/25

What is the standard form of the equation of a circle?

• x+y=r

• (x-h)+(y-k)=r

• (x-h)²+ (y-k)²= r²

• (x+h)-(y+k)=r

What is the center and the radius of the circle with the equation (x+5)²-(y-7)=64?

• center: (5,7)

  radius: 32

• center: (-5,7)

  radius: 8

• center: (5,-7)

  radius: 16

• center: (-5,-7)

  radius: 8

Which equation is for the circle centered at (9,3) and has a radius of 7?

• (x+9)²+(y+3)²=14

• (x+3)²+(y-9)²=49

• (x+9)²+(y+3)²=49

• (x-9)²+(y-3)²=49