In a right triangle there is only one acute angles.
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An acute angle is less than 90 degrees. Dividing a square into four equal triangles would not have any acute angles since they would all be 90 degrees. A 90 degree angle is called a right angle.
It can have 0 or 2 right angles, 1 or 2 acute or obtuse angles.
Yes. Many triangles can for example, an equalateral triangle
A rhombus will either have four right angles, or two acute angles and two obtuse angles.