| How many diagonals are needed to divide a heptagon, a nonagon, and an undecagon into triangles? |
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| The room is shaped as a large nonagon, its sheer walls, a flat metallic grey, rising almost two stories up and curving into a dome. |
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| What's the perimeter of a nonagon whose sides are each twice the length of the side of a square whose area is 16 square units? |
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| The associated geometric shape is the nonagon. |
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| For example, polygon names such as pentagon, heptagon, octagon and nonagon, use Greek numbers as prefixes to mean n-angled shapes. |
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| Nonagon Infinity showed just how far they were willing to go in pursuit of a concept. |
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