Final answer:
To track multiple pages that share a common base path in a website's goal settings, use the 'Begins with' match type and the URI pattern '/thankyou'. This will include all variants of the URI that start with /thankyou.
Step-by-step explanation:
To create a goal in the "Master Profile" for a website that matches the following pages:
- www.mysite.com/thankyou/shoes
- www.mysite.com/thankyou/shirt
- www.mysite.com/thankyou
The appropriate match type to use would be Begins with; and the correct URI (Uniform Resource Identifier) pattern would be /thankyou. This match type and pattern combination ensures that any URL that starts with the specified pattern will trigger the goal, regardless of what follows after '/thankyou'.