Math Chapter 2.2 Circles

Question 1

What is the formula for standard form of equation of the circle

Answer 1

(x-h)^2 + (y-k)^2 = r^2
Center(h,k)
Radius = r (R>0)

Question 2

Write an equation of the circle in standard form and
graph the circle.
Center: (0, –3) Radius: 2
Slide 6 2.2 Circle
Graph

Answer 2

The equation is x^2 + (y+3)^2 = 4

Question 3

Write an equation of the circle in standard form and
graph the circle.
Center: (4, 3) Radius: 3
Slide 6
Graph

Answer 3

The equation is (x-4)^2 + (y-3)^2 = 9

Question 4

Write the General Form of an Equation of a Circle

Answer 4

X^2 + Y^2 + Ax + By + C = 0

Question 5

Write the equation of the circle in standard form.
Identify the center and radius.
Slide 15
x^2 + y^2 - 4x -20y+68 = 0

Answer 5

Answer = C = (2,10)
R = 6