Answer:
Number of Sides:
Hexagon 6
Heptagon 7
Octagon 8
Nonagon 9
Decagon 10
Undecagon 11
Dodecagon 12
Number of diagonals:
Hexagon 9
Heptagon 14
Octagon 20
Nonagon 27
Decagon 35
Undecagon 44
Dodecagon 54
Number of triangles:
Hexagon 4
Heptagon 5
Octagon 6
Nonagon 7
Decagon 8
Undecagon 9
Dodecagon 10
Sum of the interior angles:
Hexagon 720
Heptagon 900
Octagon 1080
Nonagon 1260
Decagon 1440
Undecagon 1620
Dodecagon 1800
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Answer:
Number of Sides:
Hexagon 6
Heptagon 7
Octagon 8
Nonagon 9
Decagon 10
Undecagon 11
Dodecagon 12
Number of diagonals:
Hexagon 9
Heptagon 14
Octagon 20
Nonagon 27
Decagon 35
Undecagon 44
Dodecagon 54
Number of triangles:
Hexagon 4
Heptagon 5
Octagon 6
Nonagon 7
Decagon 8
Undecagon 9
Dodecagon 10
Sum of the interior angles:
Hexagon 720
Heptagon 900
Octagon 1080
Nonagon 1260
Decagon 1440
Undecagon 1620
Dodecagon 1800