the vertex of an angle is the point where the rays or line segments meet.

why is B used more than A in these questions?

I'm not sure. thank you for making me notice that

At 11:00 how do I practice to get better at noticing angles, can khan academy help me with that

A place where two rays meet is called an angle.

why are angels measured in degress

the babylonians (an ancient civilization, like Greeks) invented the 360 degree value which is the maximum an angle can be (which is a complete circle and after that, it kinda repeats on itself and the value of the angle gets even bigger). It's based on their base 60 counting (/number) system. There also exist other ways like radian ( angles are measured in pi) and tau (basically, "2*radians" tau = 2pi.)

super easy and fun once you get to know it!

Yep I agree! Giving u an upvote!

why are you not showing if it is a right angle or something like that?

Because you need to figure it out yourself

how do you measure an angle

ABC angle would measure how far A to C is

Main content

Angle basics review

Google Classroom

Review what an angle is and how an angle is measured.

What is an angle?

An angle is two rays that share a start color #11accd, start text, v, e, r, t, e, x, end text, end color #11accd.

Intersecting lines or line segments also form angles.

Practice: Identifying an angle

Problem 1

Which of the following figures is an angle?

Measuring angles

Angles are measured in degrees.

The wider an angle is open, the greater its measure. If you compare these two angles, the first one is open wider.

So, the measure of this angle

is greater than the measure of this angle.

Practice set: Which angle is greater?

Problem 2A

Current

Which angle measure is greater?

Want to try more problems like this? Check out this exercise.

Want to join the conversation?

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Dawson Allen
Posted 6 years ago. Direct link to Dawson Allen's post “What is a Vertex?”
What is a Vertex?
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(66 votes)
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- Tom Marvolo Riddle
  Posted 5 years ago. Direct link to Tom Marvolo Riddle's post “the vertex of an angle is...”
  the vertex of an angle is the point where the rays or line segments meet.
  Comment on Tom Marvolo Riddle's post “the vertex of an angle is...”
  (113 votes)
JacobthePlayer
Posted 5 years ago. Direct link to JacobthePlayer's post “So, do angles relate to s...”
So, do angles relate to shapes like squares and circles?
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(28 votes)
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- alvini
  Posted 8 months ago. Direct link to alvini's post “they do”
  they do
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caylee.kohn
Posted 2 years ago. Direct link to caylee.kohn's post “why is B used more than A...”
why is B used more than A in these questions?
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(21 votes)
Answer
- 2234014
  Posted 7 months ago. Direct link to 2234014's post “I'm not sure. thank you ...”
  I'm not sure.
  
  thank you for making me notice that
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  (7 votes)
20mendozaadrian
Posted 5 years ago. Direct link to 20mendozaadrian's post “At 11:00 how do I practic...”
At
11:00
how do I practice to get better at noticing angles, can khan academy help me with that
Button navigates to signup pageComment on 20mendozaadrian's post “At 11:00 how do I practic...”
(18 votes)
Answer
- jaiswaljulie25
  Posted 9 months ago. Direct link to jaiswaljulie25's post “A place where two rays me...”
  A place where two rays meet is called an angle.
  Comment on jaiswaljulie25's post “A place where two rays me...”
  (8 votes)
Smiley Face
Posted 13 days ago. Direct link to Smiley Face's post “upvote me if you live on ...”
upvote me if you live on earth
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(20 votes)
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Nahu Gebre
Posted 2 years ago. Direct link to Nahu Gebre's post “why are angels measured i...”
why are angels measured in degress
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(18 votes)
Answer
- Kshitij
  Posted 6 months ago. Direct link to Kshitij 's post “the babylonians (an ancie...”
  the babylonians (an ancient civilization, like Greeks) invented the 360 degree value which is the maximum an angle can be (which is a complete circle and after that, it kinda repeats on itself and the value of the angle gets even bigger). It's based on their base 60 counting (/number) system. There also exist other ways like radian ( angles are measured in pi) and tau (basically, "2*radians" tau = 2pi.)
  Button navigates to signup page
  (6 votes)
akywi
Posted 9 months ago. Direct link to akywi's post “how do you measure an ang...”
how do you measure an angle
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(14 votes)
Answer
- ethan.smidt
  Posted 8 months ago. Direct link to ethan.smidt's post “ABC angle would measure h...”
  ABC angle would measure how far A to C is
  Comment on ethan.smidt's post “ABC angle would measure h...”
  (12 votes)
aarohshukla2010
Posted a month ago. Direct link to aarohshukla2010's post “super easy and fun once y...”
super easy and fun once you get to know it!
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(15 votes)
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- Sarahcoconut
  Posted a month ago. Direct link to Sarahcoconut's post “Yep I agree! Giving u an ...”
  Yep I agree! Giving u an upvote!
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  (5 votes)
skylar.thomas
Posted 2 years ago. Direct link to skylar.thomas's post “what is a plane figure”
what is a plane figure
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- 455418
  Posted 7 months ago. Direct link to 455418's post “1000”
  1000
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  (8 votes)
gjbaboyian
Posted 4 years ago. Direct link to gjbaboyian's post “why are you not showing i...”
why are you not showing if it is a right angle or something like that?
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(15 votes)
Answer
- .:Gabriela_Marq:.
  Posted 6 months ago. Direct link to .:Gabriela_Marq:.'s post “Because you need to figur...”
  Because you need to figure it out yourself
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  (3 votes)

4th grade

Course: 4th grade > Unit 11