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There are 2 NRICH Mathematical resources connected to Dynamic geometry, you may find related items under Physical and digital manipulatives.
Broad Topics > Physical and digital manipulatives > Dynamic geometryNever used GeoGebra before? This article for complete beginners will help you to get started with this free dynamic geometry software.
Prove that a triangle with sides of length 5, 5 and 6 has the same area as a triangle with sides of length 5, 5 and 8. Find other pairs of non-congruent isosceles triangles which have equal areas.