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Lesson 2: Angle introduction

# Identifying an angle

Sal matches pictures of angles to their degrees. Created by Sal Khan.

## Want to join the conversation?

• whats a acute
• An angle smaller than 90 degrees. an obtuse angle is bigger than 90 degrees but smaller than 180 degrees. A right angle is exactly 90 degrees. A straight angle is exactly 180 degrees
• Is there a angle bigger then 360
• Yes, we can make angles larger than 360 degrees. Just imagine that the two rays making an angle could be rotated as much as you want.
In one rotation, we get to 360 degrees. In two rotations, you can assume the measure to increase by 2 times, which gives us 720 degrees and so on.
Angle measures can go up to infinite degrees.
• Isn't it hard to tell without a protractor sometimes?
• sometimes but usualy only if you are looking for precice exact numbers that havent bean rounded to the nearest place value. but if their are answer choises that are very different or you are looking for a ruf estemation, than you can usualy eyeball it.
• How do I cite Khan Academy as a resource in APA style
• URL: Give the full URL of the web page including the protocol (http:// or https://). To cite a Khan academy video in a reference entry in APA style 7th edition include the following elements: Title of the video: Only the first letter of the first word and proper nouns are capitalized.
• I've watched this video three times and it's still not marked as having been watched. The subtitles aren't showing either so I'm having to follow the transcript. I'm on Google Chrome on the iPad, if that makes a difference
• if a angle is 91 degrees can it still be counted as a right angle
• No, it would be an obtuse angle. Even if an angle were 90.1 degrees or 89.99 degrees, it wouldn't be a right angle, because a right angle measures exactly 90 degrees.
• but,Sal,it does NOT make any sense, if a 60 degrees is more than 30 degrees,it is LESS than 90 degrees,isn't it?
• What is the angle between two hands of a clock at