How to Measure Angles Using a Protractor | Math with Mr. J

What is the first step when measuring an angle with a protractor?

• Line up the baseline with an arm.

• Place the center point on the vertex.

• Read the numbers on the protractor.

• Determine if the angle is acute or obtuse.

After placing the protractor's center point on the angle's vertex, what is the next step?

• Read the measurement of the angle.

• Line up the baseline with one of the angle's arms.

• Determine if the angle is acute or obtuse.

• Draw another arm for the angle.

If the baseline of the protractor is aligned with the 0-degree mark on the outer scale, which scale should you use to read the angle's measurement?

• The inner scale.

• The outer scale.

• Either scale, as they are the same.

• The scale that shows 90 degrees.

What do the smallest tick marks on a protractor represent?

• 5 degrees

• 10 degrees

• 1 degree

• 0 degrees

What is the measure of the angle shown in the first example?

• 110 degrees

• 70 degrees

• 80 degrees

• 100 degrees

What is the measure of the angle shown in the second example?

• 20 degrees

• 150 degrees

• 160 degrees

• 170 degrees

What is the measure of the angle shown in the third example?

• 85 degrees

• 90 degrees

• 95 degrees

• 100 degrees

What is the measure of the angle shown in the fourth example?

• 45 degrees

• 135 degrees

• 50 degrees

• 140 degrees