Reflections on the Coordinate Plane
Use the points in your notes from page 11
Make sure the blue dashed line is on the correct axis
Activity 1: Reflecting Over the x - axis
Move points J and K so that they lie on the x - axis.
1) Click and drag Triangle ABC. Change the size of Triangle ABC. What do you notice bout the size and shape of Triangle A'B'C'?
2) State the coordinates of Triangle ABC and the coordinates of Triangle A'B'C'.
A (___,____) --> A' (___,____)
B (___,____) --> B' (___,____)
C (___,____) --> C' (___,____)
3) What changes in the coordinate(s) do you notice when reflecting over the x - axis?
4) Fill in the blanks.
BIG IDEA: When reflecting across the x - axis, the _________ coordinate changes ______________.
Activity 2: Reflecting Over the y - axis
Move points J and K so that they lie on the y - axis.
1) Click and drag Triangle ABC. Change the size of Triangle ABC. What do you notice bout the size and shape of Triangle A'B'C'?
2) State the coordinates of Triangle ABC and the coordinates of Triangle A'B'C'.
A (___,____) --> A' (___,____)
B (___,____) --> B' (___,____)
C (___,____) --> C' (___,____)
3) What changes in the coordinate(s) do you notice when reflecting over the y - axis?
4) Fill in the blanks.
BIG IDEA: When reflecting across the y - axis, the _________ coordinate changes ______________.