Any polygon can contain acute interior angles.
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A triangle has only 3 interior angles. It may have either 3 acute internal angles or 2 acute and 1 obtuse internal angles.
Yes. In fact, there has to be at least two. Acute angles are angles less than 90 degrees.
It can have a mixture of both acute and obtuse angles providing that the 4 interior angles add up to 360 degrees.
All acute triangles have 3 interior angles and 3 exterior angles. This is true for all triangles.
An isosceles triange has 2 equal sides and 2 equal interior angles whereas an acute triangle has 3 unequal sides and 3 interior acute angles of different sizes