Angles Using a Protractor

This is what kind of angle?

• obtuse

• right

• straight

• acute

Is this the correct way of using a protractor to measure an angle

• Yes, because the vertex of the angle is aligned with the center point of the protractor.

• No, because the baseline of the protractor is not aligned properly with the bottom ray of the angle.

This is the wrong way of using a protractor because __________.

• the bottom line of the angle is not aligned to the baseline of the protractor.

• the vertex of the angle is not aligned to the center point of the protractor.

Why is this not a 85° angle?

• 85° is an acute angle. The picture shows a right angle as it is 90°.

• 85° is an obtuse angle. The picture shows an acute angle as it is less than 90°.

• 85° is an obtuse angle.The picture shows an acute angle as it is less than 90°.

• 85° is an acute angle. This picture shows an obtuse angle as it is more than 90°.

What is the measure of angle D shown on the protractor? (a)  

• 90 degrees

• 20 degrees

• 100 degrees

• 80 degrees

What is the angle measurement? ​ (a)  

What is the measure of Angle JKL to the nearest degree?

• 55°

• 65°

• 125°

• 135°

What is the measure of angle O shown on the protractor? (a)  

• 25 degrees

• 165 degrees

• 15 degrees

• 10 degrees

What is the angle?​ ​ ​ (a)  

What is the measure of the angle on the protractor? (a)  

• 20 degrees

• 25 degrees

• 30 degrees

• 40 degrees