Yes.
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No. All triangles MUST have at least two acute angles.
No, but all equilateral triangles are acute. Acute: All angles of the triangle are less than 90 degrees. Equilateral: All angles of the triangle are 60 degrees.
All equilateral triangles are acute triangles, since all the angles are less than 90 degrees.
An acute triangle has all three angles less than 90 degrees.
All triangles need at least two acute angles