√2 ≈, 1,41, 1,76, 1,09, 2, π≈, -3/5, 2,11, 3,14, 5, rombul are, diagonalele congruente, diagonalele perpendiculare , suma unghiurilor de 180°, laturile opuse egale, dreptunghiul: , are toate laturile egale, Are laturile opuse sunt concurente, e un patrulater concav, are diagonalele congruente, π∈, ℤ, ℕ, ℚ, ℝ, 2√3 × 3√4, √432, √36, √420, √48, x∈ℕ | x²=144, x=12, x=72, x=-12, x=36.

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