Can a triangle have two right angles? Why?

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What is a quadrilateral with only 2 right angles?

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How can I proof that the two right triangles are congruent? I know that proofing that BD is the angle bisector of angles CBF and FDC will do the trick, but don't

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Does an obtuse triangle have two acute angles?

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Are all right triangles scalene?

Can a triangle have 2 obtuse angles?