The bottom line on a half-circle protractor that you start measuring from?

The bottom line on a half-circle protractor that you start measuring from?

• A. Zero line
• B. Baseline
• C. Base line
• D. Origin

Answer: (C)

The bottom straight edge of a half-circle protractor is called the baseline. It serves as the reference line from which you measure angles. To use it, place the angle’s vertex at the center of the protractor and align one side of the angle with the baseline. Then read the size of the angle from the curved scale where the other side crosses. The term baseline is the standard way to name that reference line (you might also see it written as “base line,” but baseline is most common).

The bottom straight edge of a half-circle protractor is called the baseline. It serves as the reference line from which you measure angles. To use it, place the angle’s vertex at the center of the protractor and align one side of the angle with the baseline. Then read the size of the angle from the curved scale where the other side crosses. The term baseline is the standard way to name that reference line (you might also see it written as “base line,” but baseline is most common).