| 21. | They aren't perfect squares, but that's as close to perfect squares as you'll ever see.
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| 22. | Every odd perfect square is a centered octagonal number.
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| 23. | NEW YORK _ Mathematically speaking, Columbus Park in Lower Manhattan is not a perfect square.
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| 24. | The county has the unusual distinction of forming a perfect square by Mercator map projection.
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| 25. | The third try produces the perfect square of 441.
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| 26. | This room is a perfect square, with a lofty dome and trellised windows at its base.
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| 27. | Warren Bosworth also invented new stringing patterns like the Bosworth Pattern, perfect squares surrounded by rectangles.
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| 28. | The fort was in area and was surrounded by massive walls, forming an almost perfect square.
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| 29. | The building has an almost perfect square plan, measuring, having a slight pitch on the roof.
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| 30. | The square of an integer may also be called a square number or a perfect square.
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