1. Materials Reminders

2. Get out your agenda if you see your name below. You need to come to my room tomorrow. Period 2Period 7

3. Define the following terms. Congruent – Supplementary – Complementary – Answer true or false. Assume that the angles are formed from two parallel lines cut by a transversal. 1.Alternate interior angles are congruent. 2.Corresponding angles are not congruent. 3.Vertical angles are congruent.

4. 6-3 Polygons and Angles How do I find the sum of the angle measures of a polygon and the measure of an interior angle of a regular polygon?

5. Questions:Notes: What is the sum of the interior angles of a triangle? a b c What is a regular polygon? Regular Polygon – a polygon where all the sides are congruent and all the angles are congruent. Examples:

6. Questions:Notes: How do I find the sum of the measures of the interior angles of a polygon? Number of Sides (n) FigureNumber of Triangles Sum of Angle Measure 3 4 5 6 7

7. Questions:Notes: Number of Sides (n) FigureNumber of Triangles Sum of Angle Measure 311(180)=180 422(180)=360 533(180)=540 644(180)=720 755(180)=900 What expression represents the number of triangles in an n-sided polygon?

8. Questions:Notes: Number of Sides (n) FigureNumber of Triangles Sum of Angle Measure 311(180)=180 422(180)=360 533(180)=540 644(180)=720 755(180)=900 What expression represents the sum of the angle measures in an n-sided polygon?

9. Questions:Notes: How do I find the measure of one interior angle of a regular polygon? Example:

10. Concept Check 1.Get into groups of 2 and using a white board, explain to each other how to find the sum of the measures of the interior angles of the following polygons. Square Octogon 28-gon 152-gon

11. Concept Check 1.Get into groups of 2 and using a white board, explain to each other how to find the measure of an interior angle for the following REGULAR polygons. Triangle Square Pentagon Hexagon

12. Homework Page 318-319; 5-16 AND Cornell Notes Summary