Shapes that do not have volume (they are flat) are called two-dimensional (2D), e.g. the square and the circle. Tip: A quadrilateral is a closed 2D-shape formed by four straight lines, e.g. a square.
Shapes that do not have volume (they are flat) are called two-dimensional (2D), e.g. the square and the circle.
Tip: A quadrilateral is a closed 2D-shape formed by four straight lines, e.g. a square.
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