Every triangle must have either 2 or 3 acute angles.
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All triangles have at least two acute angles. Acute triangles have three. Rhomboids also have two acute angles.
Yes. In fact, all triangles MUST have at least two acute angles.
Every triangle must have at least 2 acute angles, otherwise it is impossible to make the 3 sides connect.
No. Except for the case of a square (a special case of rhombus), a rhombus will have 2 congruent acute angles, and 2 congruent obtuse angles. The square has 4 right angles. In fact, every quadrilateral will have either all 4 angles equal to right angle (square and rectangle), or will have at least 1 obtuse angle (also at least 1 acute).