P3 Making Triangles 1 (Grid)

① This example demonstrates how to construct triangles on a grid by connecting points, with interactive buttons and instruction text to help students intuitively understand the composition of a triangle. ② Core math concepts include the definition of a triangle, the correspondence between vertices and sides, and locating points using grid coordinates. ③ Construction highlights: uses GeoGebra's Segment command to draw segments (e.g., SegBlue1, SegRed1), Sequence to generate point lists (ListDots), and buttons (buttonNewQ, buttonDotGrid) to control new problems and grid visibility; objects include Blue/Red point sets and segments, as well as dependent points. ④ Suitable for upper elementary or lower middle school geometry introduction, also useful for math activity classes to reinforce basic properties of triangles through hands-on manipulation.