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## Geometry (all content)

### Course: Geometry (all content)>Unit 2

Lesson 5: Angle types

# 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
• i only have 2 votes at all please upvote me it helps alot and when i reach i send a link to a secret website cant tell you what it is fine ill tell you what it is its a secret yt i made that will help alot
• sadly none upvoted this one but i still reached it upvote when i hit 20 upvotes posting another one!
• so i ended up reaching 17 upvotes here you go to theses (If the total clock face represents 360°, then each number on the clock represents an angle of 30° and each minute, 6°. So at the minute hand is at 30*6° = 180° and the hour hand is at 4.5*30° = 135°. Thus the angle between them is 180°-135° = 45°) by nathain.w
• 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.
• 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.
• 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.
• 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.