Final answer:
To calculate the value of the unknown in △ADG with AG∥BF∥CE, we need to use a specific equation and substitute the given values into it.
Step-by-step explanation:
Given the information that △ADG with AG∥BF∥CE, we are asked to calculate the value of the unknown. Based on the given statement B, we know that AGº is negative, which means K must be a number greater than 1. Substituting the values of AGº and Q into Equation 19.9.11 or Equation 19.8.11, we can calculate AG.