Not necessarily, but it can.
It has twelve angles but all of them need not be acute.
There are three acute angles in an acute triangle and they add up to 180 degrees.
A rectangle or a square.
three
0 or 4
it has no acute angles
there are three acute angles in an acute triangle, because there are three corners.
no
parallelagram
Not necessarily, but it can.
parallelagram http://en.wikipedia.org/wiki/Parallelagram well specifically you would be a rectangle which has parallel sides like a square. a parallelogram can be a square or a rectangle because they all have parallel sides but only squares and rectangles have right angles on all sides. parallelograms have congruent sides which require acute and obtuse angles.
In an acute triangle, all three angles are acute.
There can be 1 or 2 acute angles.
there are three acute angles in an acute triangle, because there are three corners.
The letter "N" as two acute angles.
It has twelve angles but all of them need not be acute.