**數學科**

Symbols for MM Type

N = Notes

I = Interaction

**F.1 - 3**

Topic | Description | MM Type |

Geometry > Polygon | Draw polygons and measure each external angles immediately. Users can move vertices to the "centre" of the polygon to discover that combining all the external angles really forms a "circle". |
I |

Geometry > Triangle > Centres of a Triangle | Show the orthocentre, centriod, circumference and incentre and the corresponding circles and lines, for triangles of different shapes |
I |