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CCGPS Geometry

UNIT QUESTION: How are the equations of circles and parabolas derived?

Standard: MCC9-12..A.REI.7, G.GPE.1,2 and 4

Today’s Question:

How is the equation of a circle derived?

Standard: MCC9-12..G.GPE.1

EOCT Practice Question

- Use the Quadratic formula to find the solutions to the following quadratic equation:
- a.) c.)
- b.) d.)

Circle:

- What are the coordinates of this circle’s center?
- What is its radius?

Standard Form of a Circle

Circle with center at the origin (0,0)

Standard form of a circle that is translated

**Center: (h, k) Radius: r **

Finding the Equation of a Circle

Write the standard form of the equation for the circle that has a center at the origin and has the given radius.

1. r = 9 2. r = 14 3.

Writing Equations of Circles

Write the standard equation of the circle:

Center (4, 7) Radius of 5

(x – 4)2 + (y – 7)2 = 25

Write the standard equation of the circle:

Center (-3, 8) Radius of 6.2

(x + 3)2 + (y – 8)2 = 38.44

Writing Equations of Circles

Write the standard equation of the circle:

Center (2, -9) Radius of

(x – 2)2 + (y + 9)2 = 11

Equation of a Circle

The center of a circle is given by (h, k).

The radius of a circle is given by r.

The equation of a circle in standard form is

(x – h)2 + (y – k)2 = r2

To write the standard equation of a translated circle, you may need to complete the square.

Graphing a circle in Standard Form!!

Example:

Standard Form!!

Center: (4, 0) r: 3

Write the standard equation for the circle. State the center and radius.

Write the standard equation for the circle. State the center and radius.

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