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Java Games: Flashcards, matching, concentration, and word search. |
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Number of Diagonals in a Polygon
Students will use the formula of n(n - 3) / 2 to determine the number of diagonals in various polygons.
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| A | B |
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| triangle | 0 |
| quadrilateral | 2 |
| pentagon | 5 |
| hexagon | 9 |
| octagon | 20 |
| enneagon | 27 |
| decagon | 35 |
| hendecagon | 44 |
| dodecagon | 54 |
| triskaidecagon | 65 |
| tetrakaidecagon | 77 |
| pendedecagon | 90 |
| hexdecagon | 104 |
| heptdecagon | 119 |
| octdecagon | 135 |
| enneadecagon | 152 |
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Hunter GT/AIG Magnet Elementary |
| Raleigh, NC |
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