Ah, what a lovely question! The shape you're thinking of is a triangle. Triangles have three straight sides and no right angles. They come in all different sizes and can be found in nature and in art. Just imagine all the beautiful landscapes you could create with triangles!
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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.
A shape with parallel sides but no right angles is called a parallelogram
A RECTANGLE has 4 sides and 4 right angles.
Squares and rectangles have a two-dimensional shape with four sides and four right angles.
A rhombus has four equal sides but no right angles.