They are all polygons having their own particular properties
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All their sides are the same length
All squares are rectangles also, but not all rectangles are squares, only equilateral rectangles are considered square.
Squares have two dimensions - length and width. Two dimensional figures are things like squares, rectangles, circles, and triangles, which have length and width.
2 triangles and 3 rectangles(:
triangles squares rectangles i think most shapes could have a 90 degree angle except a circle