#### MG 54 – PROPERTIES AND CROSS-SECTIONS OF THREE-DIMENSIONAL OBJECTS

Children continue to develop their understanding that straight lines that meet at points are edges that meet at vertices, and that curved lines are just curved lines.
They also continue to develop their understanding that flat surfaces with straight lines are faces, that flat surfaces with curved lines are just flat surfaces, and that curved surfaces are just curved surfaces.
They describe the properties of prisms and pyramids, identifying that prisms have 2 parallel bases and their faces that are not bases are quadrilaterals and pyramids have 1 base and their faces that are not bases are triangles, explaining that prisms and pyramids are named by the shape of their base/s.
Children identify sections and cross-sections on prisms and pyramids, identifying cross-sections are parallel to the base/s and prisms have uniform cross-sections and pyramids have non-uniform cross-sections.

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