# The diagonal triangle

Geometry Level pending

Let $$OA$$, $$OB$$ and $$OC$$ be three adjacent edges of a cuboid. Then, which of the following statements could be true.

[1] All the angles in $$\triangle ABC$$ are acute.

[2] $$\triangle ABC$$ is right-angled.

[3] $$\triangle ABC$$ has one obtuse angle in it.

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