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  1. Oxford Dictionary

    spherical trigonometry

    • n.
      the branch of trigonometry concerned with the measurement of the angles and sides of spherical triangles.

    • noun: spherical trigonometry

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    spherical trigonometry

    • IPA[ˈsfirəkəl]
    • n.
      the branch of trigonometry concerned with the measurement of the angles and sides of spherical ...

    Oxford American Dictionary