Triangles may be
right triangles
equilateral triangles
acute or obtuse triangles
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Equaliateral Triangles have all three sides and angles (60 degrees)equal Isosceles Triangles have to equal sides and angles Scalene Triangles have no equal sides or angles
All triangles have at least two acute angles. Acute triangles have three. Rhomboids also have two acute angles.
The shapes that have 3 sides and 3 vertices are called triangles. Triangles are classified based on the lengths of their sides and the measures of their angles. The three most common types of triangles are equilateral triangles (all sides and angles are equal), isosceles triangles (two sides and two angles are equal), and scalene triangles (all sides and angles are different).
They're similar triangles.
some triangles and rhombuses. trapoziods do not have acute angles it has obtuse angles. :)