Reflect a triangle across the x- or y-axis and observe how the coordinates of each vertex are transformed.
[i]Answer these open ended questions on your own or with others to form deeper math connections.[/i]
How do the coordinates of the triangle change as it is reflected across the [math]x[/math]-axis? How do they stay the same?
What changes in the coordinates of the pre-image and image of a triangle that reflects across the [math]y[/math]-axis? What stays the same?