L4 angles in polygons
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The document provides examples and explanations of geometry concepts including finding the perimeter of a regular octagon where one side is 12 cm, the triangle sum rule stating the interior angles of a triangle sum to 180 degrees, the definition of a diagonal as a line segment connecting two non-adjacent vertices of a polygon, and examples of finding the number of diagonals in nonagons and dodecagons.
L4 angles in polygons
- 1. Problem of the day Write a formula to find the perimeter of a regular octagon. Find the perimeter if one side is 12 cm.
- 2. Triangle Sum Rule • How many degrees in a triangle? 180
- 3. • Diagonal – line segment that connects two non- adjacent vertices of a polygon
- 4. Example 1 • How many diagonals does a nonagon have?
- 5. Example 1
- 6. Example 1
- 7. Example 2
- 8. Example 3
- 9. Quick Check • How many diagonals does a dodecagon have?