Number of Diagonals in a Polygon

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Math II 6.5 Lesson

Based on Lesson 6.5 from Open Up Resources

Practice using geometric reasoning in computational work.

How do I look for structure in a diagram so I can use familiar features of the diagram to find the measures of unknown sides and angles?

What measurements do I need to calculate first, in order to calculate additional measurements?
  1. mathandfun
  2. translation
  3. rotation
  4. reflection
  5. definitions
  6. postulates
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this is easy!! picketing a point and making diagonals.
pattern is number of polygon sides -3 equals the number of diagonals in the polygon !!

LithzyDiaz-tkps