Acute
Isosceles
A 30-60-90 right triangle
Equilateral triangles.
Right Triangles
Equilateral triangles have rotational symmetry.
Scalene triangles
A 30-60-90 right triangle
Generally a parallelogram will be split into two scalene triangles by a diagonal; depending upon which diagonal, they will be acute or obtuse. However, it is possible for the diagonal to be the same length as one of the sides, in which case it will be split into two isosceles triangles. For the special case of the "regular" parallelogram (whereby every side is equal in length, and it is otherwise known as a Rhombus) it will generally be split into two isosceles triangles, but the diagonal could be the same length as the sides and it will be split into two equilateral triangles.
That will depend on what type of triangle it is as for example if it is an isosceles triangle then it will form two congruent right angle triangles.
it is a right triangle because a rhombus' diagonals are perpendicular
Right Triangle
isosceles triangle
An isosceles triangle
Equilateral triangle
Equilateral triangles.
Right Triangles
90 degree triangles are always similar.
Equilateral triangles have rotational symmetry.