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Lesson 1: Understanding angle measurement

# Measuring angles with a circular protractor

Lindsay measures angles with a circular protractor.

## Want to join the conversation?

• Around the voiceover says you can go up to 360 degrees in an angle. I don't see 360 degrees on the protractor though. So, if it starts at 0 degrees will it end at 0 degrees to make a 360 degree angle? Sorry if I made that question confusing.
• You're right, both legs of a 360 degree angle would be in line with each other, same as with a 0 degree angle. The difference is that you're starting at 0 and measuring all the way around the circle, instead of starting at 0 and moving the endpoint zero degrees.
It would be accurate for the protractor to have a 360 degree mark there, but it doesn't because you can figure out that it's the same position as zero, just as you've done. It's sort of like how a clock with minute markings doesn't have 60 minutes marked, only 0.
• Can you use a semicircle protractor to measure up to 360 degrees?
• It is always possible to flip a semi-circle protractor.
• Is this booring or is it just me
• Are all angles in circles obtuse?
• No, technically circles don't have any angles, since it is a closed, curved line. An angle is never closed.
• hi i like this it helped me alot
• How many degrees are in 1/3 of a full turn?
• There are 360 in a full angle. 360/3 = 120. Your answer will substantially be 120. - Carbon
• what does semi mean?
• it means half in latin