We draw a table of values:
| t | 0 | π/4 | π/2 | 3π/4 | π | 5π/4 | 3π/2 | 7π/4 | 2π |
| x | 0.7 | 0 | -0.7 | -1 | -0.7 | 0 | 0.7 | 1 | 0.7 |
| y | 0 | 1 | 0 | -1 | 0 | 1 | 0 | -1 | 0 |
| Pt no. |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
The sketch is:
This curve is part of a parabola.
Of course, it would have been better to start our values from t = 3π/4 (Point 4) and only use Points 4, 5, 6, 7, and 8. But you don't know that until you have drawn it.