If a rectangular loaf of bread was cut into slices, the shape and size of each slice would be the same. The loaf is very close to being a prism.

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3-dimensional shapes have faces, edges and vertices. Volume is the space contained within a 3D shape. Surface area is the sum of the area of each face. 3D shapes can be viewed from different points.

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A prism has a cross-sectionclosecross-sectionA shape or surface that is shown as the result of cutting through it in half, so that the inside can be seen, eg a cross-section of a river or of a mathematical shape. which is exactly the same shape and size throughout its length.