Instructions.
Explore the properties of reflection dynamically! Click and drag the vertices of the original blue triangle (\(A\text{,}\) \(B\text{,}\) or \(C\)) to see how the green reflected image responds.
You can also drag points \(M1\) and \(M2\) to change the angle of the red Mirror Line. Notice how the dashed construction lines always remain perpendicular (at a \(90^\circ\) angle) to the mirror line, and the object and image always remain exactly the same distance from the mirror.