4 sided shapes are shapes called quadrilaterals. Such as a square, rhombus, rectangle, etc.
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A quadrilateral is a polygon with four sides and four vertices.
4sides
1 ) they all have 4sides 2 ) they all have 4corners
If you turn a square 45 degrees the Corners get cut off making 4 extra sides. 4sides + 4sides makes 8 sides. this makes an octagon
20cm/4sides = 5cm 5cm*5cm = 25cm^2