How to Translate, Reflect, and Rotate in GeoGebra
How to REFLECT ABOUT LINE
Try it for yourself here! Construct a line, and reflect the colored triangle about that line so its image is the outlined triangle on the right.
How to TRANSLATE BY VECTOR
Try it for yourself here! Construct a vector, and then translate the colored triangle by that vector so this colored triangle's image is the outlined triangle.
How to ROTATE AROUND A POINT
Try it for yourself here! Rotate the colored triangle about (0,0) so its image is the outlined triangle.