Detailed method of drawing central symmetrical triangle on geometric sketchpad

Open the geometric sketchpad and select the arbitrary triangle tool in the custom toolbar to draw an arbitrary triangle.

Double-click a vertex of the triangle and mark it as the center of rotation. Select the entire triangle, select [Transform] - [Rotate], set [Fixed Angle] to 180 degrees, and confirm. The central symmetrical triangle is drawn.

Drag any vertex of the triangle, and the symmetrical shape will change accordingly.

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