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Problem Which one of the following inequalities correctly describes the range of an obtuse angle x ( ∘ ) x\ (^{\circ}) x ( ∘ ) 90 ∘ ≤ x < 180 ∘ 90^{\circ} \le x < 180^{\circ} 9 0 ∘ ≤ x < 18 0 ∘ 180 ∘ < x < 360 ∘ 180^{\circ} < x < 360^{\circ} 18 0 ∘ < x < 36 0 ∘ 90 ∘ < x < 180 ∘ 90^{\circ} < x < 180^{\circ} 9 0 ∘ < x < 18 0 ∘ 90 ∘ < x ≤ 180 ∘ 90^{\circ} < x \le 180^{\circ} 9 0 ∘ < x ≤ 18 0 ∘ Browse the problem library