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A shape with no sides next to each other would be a one sided shape, ie, a circle.
because each side depends on each other for stability
Rectangle
That they do not tessellate with each other
Right angles!
Lots of ovals overlapping each other to create the sunflower's shape.
Trapezoid.
They are said to be congruent to each other.
You need to be in shape and be able to each other how to get in shape. It is not for everyone.
A shape with no sides next to each other would be a one sided shape, ie, a circle.
because each side depends on each other for stability
Rectangle
That they do not tessellate with each other
Right angles!
All faces on a cube are equal to each other the shape is of the face on a cube is a square
A parallelogram is any regular geometric shape in which two opposite sides are parallel to each other.
2D shape