A directory of useful objects found on the web for teaching Maths.
https://www.geogebra.org/m/xHD5f4PF
GeoGebra, Interactive, Publisher, Tim Brzezinski
Investigate and discover interior and exterior angles sums for a triangle, quadrilateral, pentagon, hexagon, heptagon and octagon.
27 June 2018 Edit: 10 July 2018
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