Stage 8 - Q3 - 4 marks
18709
Rotate triangle ABC 90 degrees anticlockwise about the origin.
x
y
-5
-5
-4
-4
-3
-3
-2
-2
-1
-1
1
1
2
2
3
3
4
4
5
5
0
A
B
C
Object
K
Hint
Use (x,y)↦(−y,x) for every vertex.