None because no triangle has any parallel sides.
None but all three sides are equal in length.
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None, two or three
There are absolutely 0 parallel lines in any given triangle.
First: Sides are not acute or obtuse. ANGLES are acute or obtuse. An acute triangle has to have all angles acute. Examples: 60, 60, 60 70, 60, 50 45, 50, 85 45, 45. 90 30, 60, 90 But if one of the angles is obtuse (>90 degrees), then the other two must be acute. Of course, *this* triangle would not be called an acute triangle, because one of its angles is abtuse; it would be called an obtuse triangle.
Every triangle must have at least 2 acute angles, otherwise it is impossible to make the 3 sides connect.
In a regular nonagon no two sides are parallel.
In an acute triangle, all three angles are acute.
An acute scalene triangle has none. An acute isosceles triangle has one and an [acute] equilateral has three.
there are three acute angles in an acute triangle, because there are three corners.
There are three acute angles in an acute triangle and they add up to 180 degrees.
It has 3 sides because an acute obtuse and a scalene has 3 sides and they are all the same length no matter what the shape is so the ANSWER IS 3 SIDES3 SIDES