Determine the angle for the "Excellent" grade.

Step 1: Determine the angle for the "Excellent" grade.
A complete circle in a pie chart represents $360^\circ$. The angles for the other grades are given:

• Pass: $120^\circ$
• Credit: $80^\circ$
• Very Good: The square symbol indicates a right angle, which is $90^\circ$.

Sum of the known angles:

$$120^\circ + 80^\circ + 90^\circ = 290^\circ$$

The angle for the "Excellent" grade is the remaining portion of the circle:

$$\text{Angle for Excellent} = 360^\circ - 290^\circ = 70^\circ$$