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# 2 17 Properties Of Diagonals

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### 2 17 Properties Of Diagonals

1. 1. Properties of diagonals<br />eq: What is the relationship between a polygon’s side and its diagonals. <br />11/23/09<br />
2. 2. Review:<br />What is an angle?<br />Acute angle?<br />Obtuse angle?<br />Right angle?<br />
3. 3. Review:<br />Straight angle?<br />What is a triangle?<br />Equilateral?<br />Scalene?<br />
4. 4. Review:<br />Isosceles?<br />Acute triangle?<br />Obtuse triangle?<br />Right triangle?<br />
5. 5. Review:<br />Congruent?<br />Line segment?<br />Ray?<br />
6. 6. Look at last chart.<br />How many diagonals were in a triangle from one vertex?<br />In a quadrilateral?<br />In a pentagon?<br />
7. 7. In a hexagon?<br />In an octagon?<br />What was the rule for finding how many diagonals could be drawn from 1 vertex?<br />
8. 8. Hand out polygon chart, polygons, rulers.<br />Record length of sides (in cm) on chart<br />
9. 9. Draw diagonals from one corner.<br />Record length of diagonals (in cm).<br />
10. 10. Conclusions:<br />Diagonals/sides congruent<br />Diagonals are longer<br />Sides are longer<br />
11. 11. Share information<br />
12. 12. EQ:<br />What is the relationship between a polygon’s side and its diagonals.<br />