Annabelle used a protractor to measure the angle below. is annabelle using the protractor correctly? explain your answer. if annabelle is using it incorrectly, explain to her how to use it correctly.

No, she is not using the protector correctly.

Step-by-step explanation:

For measuring an angle with help of protector, we follow the following steps,

1) First place the midpoint of the protractor on the vertex of the angle.

2) Cover the one side of the angle by the zero line of the protractor.

3) After this, read the degrees where the other side crosses the number scale.

But, when we see the diagram we found that the one side of the angle is not covered by the zero line,

⇒ She is using the protector incorrectly.

No, she is not using the protector correctly.

Because base arm (ray) of angle is not coinciding with line of 0° angle.  

Correct Method of using protector is following:

Step 1: Place the protector so that the mid point of its straight edge lies on the vertex of the angle.

Step 2: Cover the base arm (ray on base) of the angle by the zero angle line of the protractor.

Step 3: There are two scales on the protector. Read that scale which have 0° on the base arm of angle.

Step 4: Finally, read the scale where the other arm (ray) crosses it.