| 11. | In that Heptagonal meet, Mottley broke the world indoor record for 600 yards.
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| 12. | The centered heptagonal number for " n " is given by the formula
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| 13. | It is formed as two parallel heptagonal antiprisms connected by cubes and triangular prisms.
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| 14. | The space under the dome is equally heptagonal.
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| 15. | Demir Baba's grave lies in the middle of the heptagonal inner premises.
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| 16. | It had a fully enclosed heptagonal armored casemate.
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| 17. | The Henry patent rifling produced a heptagonal barrel with seven grooves with one turn in.
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| 18. | The 50 cent coin has a rounded heptagonal shape and has a bright silver colour.
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| 19. | The space between the eight rooms was filled with heptagonal chapels with a triangular apse.
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| 20. | The heptagonal triangle has various remarkable properties.
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