True. If you know the percentage of each section of a pie graph and have the numerical value of at least one of the sections, you can set up an equation to find the total numerical value of the pie graph. For example, if one section is 25% of the total and you know that section's value is 50, you can set up the equation:
\[ 0.25 \times \text{Total} = 50 \]
From this, you can solve for the Total:
\[ \text{Total} = \frac{50}{0.25} = 200 \]
This allows you to determine the total numerical value represented by the pie graph.