Measuring Angles with a Protractor

What is the primary function of a protractor?

• To draw circles

• To measure and draw angles

• To calculate area

• To measure length

Which angle is exactly 90 degrees?

• Right angle

• Acute angle

• Reflex angle

• Obtuse angle

Which angle is less than 90 degrees?

• Reflex angle

• Straight angle

• Obtuse angle

• Acute angle

What type of angle is more than 180 degrees but less than 360 degrees?

• Acute angle

• Reflex angle

• Right angle

• Straight angle

What is the first step in using a protractor to measure an angle?

• Estimate the angle size

• Place the protractor on the paper

• Align the protractor's center with the angle's vertex

• Choose the correct scale

How do you start measuring an angle with a protractor?

• Align the base with the protractor's straight edge

• Place the protractor's center mark on the angle's vertex

• Estimate the angle size

• Draw a circle with the protractor

What should you do after aligning one side of the angle with the zero on the protractor's outer edge?

• Erase the existing lines

• Read the scale where the other side meets the protractor

• Flip the protractor over

• Draw a new angle

What angle size should you draw if you don't have a protractor?

• 180 degrees

• 45 degrees

• All of the above using a printable protractor

• 90 degrees

What is the correct way to measure an angle that opens in an anti-clockwise direction?

• Use the outer scale of the protractor

• Use the inner scale of the protractor

• Guess the angle size

• Use a ruler instead

When measuring angles, what is a helpful tip if you're already familiar with angles?

• Measure only acute angles

• Always use the outer scale

• Start with a rough estimate of the angle size

• Ignore the protractor's numbers