No triangle is never acute in the sense that every triangle has at least two acute angles.
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No not never can a triangle have 3 obtuse angles but it can have 3 acute angles
No. Similar triangles have all the same angles. An acute triangle can never have an obtuse angle, so the two cannot be similar.
No, because if there is on obtuse angle the triangle will always be obtuse.
An obtuse triangle has 1 obtuse angle and 2 acute angles
A right angle triangle has a 90 degree angle and 2 acute angles An obtuse triangle has 1 obtuse angle and 2 acute angles