1. LESSON 7–2
Ellipses and Circles

2. Five-Minute Check (over Lesson 7-1) TEKS Then/Now New Vocabulary
Key Concept: Standard Forms of Equations for Ellipses
Example 1: Graph Ellipses
Example 2: Write Equations Given Characteristics
Key Concept: Eccentricity
Example 3: Determine the Eccentricity of an Ellipse
Example 4: Real World Example: Use Eccentricity
Key Concept: Standard Form of Equations for Circles
Example 5: Determine Types of Conics
Lesson Menu

3. Targeted TEKS
P.3(F) Determine the conic section formed
when a plane intersects a double-napped cone.
P.3(H) Use the characteristics of an ellipse to write the equation of an ellipse with center (h, k).
Also addresses P.3(G).
Mathematical Processes
P.1(A), P.1(G)

4. You analyzed and graphed parabolas. (Lesson 7–1)
Analyze and graph equations of ellipses and circles.
Use equations to identify ellipses and circles.
Then/Now

5. Analyze and graph equations of ellipses and circles.
Use equations to identify ellipses and circles.

7. Key Concept 1

8. Key Concept 1

21. LESSON 7–2
Ellipses and Circles