Equations of Circles

Front

What is the standard equation of a circle?

Back

(x-h)² + (y-k)² = r²

Front

What does (h,k) stand for in the standard circle equation?

Back

(h,k) is the center of the circle

Front

What does "h" stand for in (h,k)?

Back

h is the x in the coordinate point

Front

What does the "k" in (h,k) stand for?

Back

k is the y coordinate point in the center of the circle

Front

What does the r in the standard equation stand for?

Back

r is the radius of the circle

Front

What is the center and the radius of the circle with equation, (x-4)² + (y-2)² = 25?

Back

Center is (4, 2) and radius is 5

Front

What is the center and radius of a circle with the equation, (x-1)² + (y-3)² = 4?

Back

Center is (1,3) and radius is 2

Front

What is the center and radius of a circle with an equation (x+5)² + (y-1)² = 64?

Back

Center is (-5, 1) and radius is 8

Front

Equation of circle: (x+2)^2 + (y+4)^2 = 1

Back

Center is (-2, -4) and radius is 1

Front

Circle equation with center (4,1) and radius 3?

Back

(x-4)² + (y-1)² = 9