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8-5. Classifying Polygons. Course 2. Insert Lesson Title Here. Learn to identify and name polygons. 8-8. Angles in Polygons. Course 2. Polygon -. A closed figure with 3 or more straight sides that do not cross. 8-5. Classifying Polygons. Course 2.

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  1. 8-5 Classifying Polygons Course 2 Insert Lesson Title Here Learn to identify and name polygons.

  2. 8-8 Angles in Polygons Course 2 Polygon - A closed figure with 3 or more straight sides that do not cross.

  3. 8-5 Classifying Polygons Course 2 Determine whether each figure is a polygon. If it is not, explain why not.

  4. 8-8 Angles in Polygons Course 2 Regular Polygon - A polygon with congruent sides and angles.

  5. 8-5 Classifying Polygons Course 2 Determine whether each figure is a regular polygon. If it is not, explain why not.

  6. 8-8 Angles in Polygons Course 2 Diagonal - A straight line that joins two non-adjacent vertices of a polygon.

  7. 8-8 Angles in Polygons Course 2 Learn to find the measures of angles in polygons.

  8. 8-8 Angles in Polygons Course 2 Take the paper triangle on your desk and name the corners 1, 2, and 3. Carefully tear off two of the corners. Rotate them so the straight edges meet at the vertex and point in the same direction as the un-torn corner. You should find that they formed a straight angle. This suggests that the sum of the measures of the angles in a triangle is 180°.

  9. 8-8 Angles in Polygons Course 2 2 3 1

  10. 8-8 Angles in Polygons 2 3 1 4 Course 2 Remember this from 6th grade? How many degrees are in a quadrilateral?

  11. 8-8 Angles in Polygons Course 2 Let’s Triangulate!

  12. 8-8 Angles in Polygons Course 2 Number of sides Skip this slide. For teacher use only Name of figure (Number of triangles) x 180o = Total interior degrees

  13. 8-8 Angles in Polygons Course 2 3 sides Triangle (1)180o = 180o

  14. 8-8 Angles in Polygons Course 2 4 sides Quadrilateral (2)180o = 360o

  15. 8-8 Angles in Polygons Course 2 5 sides Pentagon (3)180o = 540o

  16. 8-8 Angles in Polygons Course 2 6 sides Hexagon (4)180o = 720o

  17. 8-8 Angles in Polygons Course 2 8 sides Octagon (6)180o = 1080o

  18. 8-8 Angles in Polygons Course 2 (# of triangles)180 = total interior degrees (1)180° = 180 ° 3 sides 4 sides 5 sides 6 sides 8 sides 50 sides n sides (2)180° = 360 ° Noticing any pattern yet??? (3)180° = 540 ° (4)180° = 720 ° (6)180° = 1080 ° (48)180° = 8640 ° (n - 2)180°

  19. 8-8 Angles in Polygons Course 2 Find the measure of the unknown angles. 1. 2.

  20. 8-8 Angles in Polygons Course 2 Find the unknown angle measure in the quadrilaterals. 4. 5.

  21. 8-8 Angles in Polygons Course 2 Take out yesterday’s notes:

  22. 8-6 Classifying Triangles Course 2 Classify each triangle according to its sides and angles. 3 C. ___ congruent sides 3 acute ___ _______ angles equilateral acute This is an________ _______ triangle. No ___ congruent sides D. obtuse 1 ___ _____ angle obtuse This is a _______ _____ triangle. scalene

  23. 8-6 Classifying Triangles Course 2 Insert Lesson Title Here Classify each triangle according to its sides and angles. 2 ___ congruent sides 1 E. obtuse ___ _______ angles isosceles obtuse This is an________ _______ triangle. F. 2 ___ congruent sides right 1 ___ _____ angle isosceles right This is a _______ _____ triangle.

  24. 8-6 Classifying Triangles Course 2 Identify the different types of triangles in the figure, and determine how many of each there are. 2 Scalene ABD, BCD 2 Isosceles ACE, ABC Right 2 ABD, BCD 1 Obtuse ACE 1 Acute ABC

  25. Math Humor What did the girl have to use to get her enormous collection of CD-Roms to her friend’s house? a CD-ROMbus!!!

  26. 8-8 Angles in Polygons Course 2 Insert Lesson Title Here Lesson Quiz Find the measure of the unknown angle for each of the following. 1. a triangle with angle measures of 66° and 77° 37° 2. a right triangle with one angle measure of 36° 54° 3. an quadrilateral with angle measures of 144°, 84°, and 48°. 84° 4. Divide a six-sided polygon into triangles to find the sum of its interior angles 720°

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