False - and false !
Not ALL angles are right-angles - and a triangle has THREE sides !
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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.
Rectangles have four sides and four angles.
Rhombus This is called a rhombus. it can have right angles but doesn't have to. all it has to have is four equal sides. So, a square is under this category. Here is the definition of a rhombus: RHOMBUS: a quadrilateral with four equal sides
A four sided figure with four equal sides and no right angles is a diamond, or a rhombus. If it had four right angles, it would be a square.
A shape that has four straight sides and four angles is defined as a quadrilateral. If all four angles are right angles, it is a rectangle, and if all four sides are congruent, it is a square.