Question

1. choose the best answer. what part of the protractor does a refer to?

options: inner scale, base line, origin, degree markings

Explanation:

To determine what part of the protractor \( A \) refers to, we analyze the options:

• The "inner scale" is the set of degree markings on the inner arc, not a point or line like \( A \).
• The "base line" is the straight edge (labeled \( B \)), not \( A \).
• The "origin" is the center point of the protractor (where \( A \) is located), as it is the reference point for measuring angles.
• "Degree markings" are the numbers (like 0, 90, 180) or the arcs with numbers, not the center point.

So, \( A \) is the origin.

Answer:

origin