symmetry
Assuming there are no more sides/angles, then it is a rectangle.
Both have right angles Have at least some matching sides
a rhombus
An irregular pentagon such as a child's silhouette of a house: a rectangle shape (open at the top) forming the body of the house, with a triangular roof on of the rectangle. The vertical line through the apex of the roof is the line of symmetry. The two walls, and the two roof lines are the two sets of equal sides. The two right angles at the base are the one set of matching angles.
a rhombus
A kite or an arrowhead.
corresponding angles
Triangle = 3 sides 3 angles Square = 4 sides 4 angles Hexagon = 5 sides 5 angles Pentagon = 6 sides 6 angles No certain name for 7 sides and 7 angles Octagon = 8 sides 8 angles Nonagon = 9 sides 9 angles Decagon = 10 sides 10 angles
corresponding and alternate angles
Sides and Angles in a TriangleBy definition, a triangle has three sides. Since the number of sides and angles is equal, it would also have three angles.
You don't tell us enough information. In a square, there are four sides and four angles. The sides are all equal and the angles are all right angles. In a rectangle, there are four sides and four angles The opposite sides are equal and the angles are all right angles. There is no other shape in which all angles are right angles.