Answer:
[tex]\color{purple}{Letter \: B.\: Protractor}[/tex]
Explanation:
A protractor is a measuring instrument, typically
made of transparent plastic or metal, for
measuring angles. Some protractors are simple
half-discs. More advanced protractors, such as
the bevel protractor, have one or two Swinging
arms, which can be used to help measure the
angle.
