Every triangle must have at least 2 acute angles, otherwise it is impossible to make the 3 sides connect.
None. An acute triangle is one in which all angles are acute. An obtuse triangle is one in which one of the angles is obtuse. A right angled triangle is one in which one angle is a right angle (90o)
There can be 10 obtuse angles. If there are no reflex angles there can by up to three acute angles (I think).
A trapezium has 2 obtuse and 2 acute angles.
three. there are 2 obtuse
the answer is 5 each tip of the star is a acute angle and each angle on the inside of the star is an obtuse angle. there are 5 obtuse angles and no right angles.