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Change of position 3
Reconstructing relations of distance 69
Locating a point in two or threedimensional space zSj
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2a children achieved angles area and volume area or volume arrangement bead change of position child is asked Child's Conception children are asked children at substage children begin children think circle co-ordinate system common measure composition Conception of Geometry Conception of Number conservation and measurement conservation of length conservation of volume considered cubes curves cycloid disc distance Doubling an area drawing equal equidistance Euclidean space experiment experimenter figures fractions grass interior volume introduced involves irregular Jean Piaget locate a point logical operations longer marbles mathematical multiplication measurement of length measuring cards measuring rod ment metric middle term moved notion objects pencil perceptual problem question re-arrangement rectangle relation right-angles rotation ruler screen shape shown side Sidney Webb simply spatial square sticks straight line string strips of paper substage 2a techniques tion transfer triangle understanding unit cubes unit of measurement whole