• Objective function, 492

  • Oblique triangle, 283, 290

  • Ohm, 364

  • Operations with zero, 10

  • Order: of operations, 8, 20; of radical, 333

  • Ordered pair, 94

  • Ordinate, 94

  • Ordinates, addition of, 316

  • Origin, 3, 94

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