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The Quran uses the plural form of the word "qutr" to refer to the Earth's many diameters, and this is important because it indicates the Earth's geoid shape.
The second noteworthy subject in the verse is that the Earth and the heavens are mentioned separately in reference to diameters. The definition of the "confines of the heavens" in Surat ar-Rahman 33 indicates the spherical structure of space.