😀2.3 對稱性

直線對稱

https://www.geogebra.org/m/eswmcFNR

直線對稱

https://www.geogebra.org/m/pgtq6a5f

直線對稱

https://www.geogebra.org/m/e4HCDcje

點對稱

https://www.geogebra.org/m/Ar2QpYk2