1)
Suppose you rotate triangle ABC counterclockwise 90º. If ABC has vertices A (-2, 1), B (-1, 4), and C (2, 2), vertex B' is ( ? , -1).
Use a rotation matrix to rotate figure DEFGH counterclockwise 90º. If the figure has coordinates D (1, 3), E (3, 2), F (1, -1), G (-3, -2), and H (-2, 2), the coordinates of E' are (-2, ?).
+118723 You are going 90 degrees clockwise.
the distance from the origin must stay the same.
the 1st quad will map to the second
the second will map to the 3rd etc
The x and y coordinates will change over but you will need to think about the signs.
B(-1,4) will map to B'(4,1)
E(3,2) will map to E'(2,-3)
+118723 You are going 90 degrees clockwise.
the distance from the origin must stay the same.
the 1st quad will map to the second
the second will map to the 3rd etc
The x and y coordinates will change over but you will need to think about the signs.
B(-1,4) will map to B'(4,1)
E(3,2) will map to E'(2,-3)
