A transformation where the figure is flipped over a line of reflection to create a mirror image is called a reflection
When you reflect a point across the x-axis, the x-coordinate remains the same, but the y-coordinate is transformed into its opposite (its sign is changed).
Symbols of interest
Here are some symbols that would be of interest to you
Symbol |
Symbol Name |
Meaning / definition |
∥ |
parallel |
parallel lines |
≅ |
congruent to |
equivalence of geometric shapes and size, ABC ≅ A'B'C' |
~ |
similarity |
same shapes, not same size |
Δ |
triangle |
triangle shape |