| Summary: | This paper aims to recover, develop, explore and expand the geometric
practices of women of the ethnic group Nyaneka-nkhumbi from southwestern Angola as evidenced in the construction of baskets of
different dimensions. We show the mathematics ‘hidden’ in the process by
identifying several of these mathematics concepts and
reflecting on their use in the classroom. We present the results of the
research developed in connection with the ethnic group using participant
observation and interviews, supported by photographic records and written
notes. Women of this ethnic group continue to
build and use baskets which involve many interesting geometry concepts for use
in classroom context. We refer, for example, to the notion of volume, conic
(truncated) and cylindrical forms, spirals, proportions, geometric figures,
patterns, plane transformations and friezes. The remarkable mathematical
practices in the baskets are characterized by much unknown ethnomathematical
knowledge that constitutes a challenge for future studies.
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