Q: What is the least number of acute angles that can be in a triangle?

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All acute triangles have 3 interior angles and 3 exterior angles. This is true for all triangles.

No triangle is never acute in the sense that every triangle has at least two acute angles.

Yes. In fact, a triangle must have at least two acute angles.

Yes.

They have [at least] two acute angles.

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Two.

2

It is 2

2

It is 2

Every triangle must have either 2 or else 3 acute angles. The least possible is 2.

Every triangle must have either 2 or 3 acute angles.

three

In plane geometry at least two angles must be acute in a triangle.

All acute triangles have 3 interior angles and 3 exterior angles. This is true for all triangles.

Yes it can. A triangle must have at least two acute angles.

No triangle is never acute in the sense that every triangle has at least two acute angles.