Unit 9.2a CW

Write an equation for the circle with:
Center at (0,0), r = 8

​ ​ (a)   +​ (b)   = ​ (c)  

• x²
• y²
• 64
• (x-8)²
• (y-8)²
• 8
• x
• y
• r
• r²

Write an equation for the circle with:
Center at (3,-1), r = 16

​ ​ (a)   +​ (b)   = ​ (c)  

• (x-3)²
• (y+1)²
• 256
• (x+3)²
• (y-1)²
• 16
• x
• y-3
• 3²

Write an equation for the circle with:
Center at (0,-4), r = 7

​ ​ x² +​ (y+4)² = ​ ___

Write an equation for the circle with:
Center at (2,3), r = √3

​ ​ (a)   +​ (b)   = ​ (c)  

• (x-2)²
• (y-3)²
• 3
• (x-3)²
• (y-2)²
• (x+2)²
• x
• y-3
• 9

Write an equation for the circle with:
Center at the origin, r = 6

​ ​ (a)   +​ (b)   = ​ (c)  

• x²
• y²
• 36
• (x-6)²
• (y-6)²
• (x+2)²
• x
• y-3
• 6

This equation:
(x-3)² + (y+7)² = 81

Is the equation of a circle, and its center is at the point:

• (3,7)

• (-3,7)

• (3,-7)

• (-3,-7)

• 9

Graph the center for the circle:
(x-1)²+(y+3)²=4

Graph the center for the circle:
(x-2)²+(y+1)²=16

The center for this circle has been graphed:
(x-1)²+(y+4)²=9

Graph the four points up, down, left, and right that are part of the circle.
(Hint: Find the radius r)

The center for this circle has been graphed:
x²+(y-3)²=4

Graph the four points up, down, left, and right that are part of the circle.
(Hint: Find the radius r)