is there any angle that could be greater than 180 degrees?

no. After 180 degrees it starts bending backwards, and it would be a acute angle again. A circle equals 360 degrees though.

Is there an angle over 720 degrees?

Yes, angles can have any angle measure. But since there's only 360 degrees in a circle, we usually don't write angles any bigger than 360. A 720 degree angle is the same as a 360 degree angle.

Is a straight angle a 180 degree angle

yes because 180 degree angle is straight like a straight angle

How am I supposed to know what angle to make if it dosen't even tell me

It already said what angle you need to make, which is a straight angle (180 degrees).

Main content

Course: Basic geometry and measurement > Unit 3

Lesson 3: Angle types

Angle types review

Google Classroom

Review the following types of angles: acute, right, obtuse, and straight. Identify and draw types of angles in some practice problems.

Summary of angle sizes

Angle type	Angle size (in degrees)
Acute	Between $0^{\circ}$ ‍ and $90^{\circ}$ ‍
Right	Exactly $90^{\circ}$ ‍
Obtuse	Between $90^{\circ}$ ‍ and $180^{\circ}$ ‍
Straight	Exactly $180^{\circ}$ ‍
Reflex	Between $180^{\circ}$ ‍ and $360^{\circ}$ ‍
Complete	Exactly $360^{\circ}$ ‍

Right angles

A right angle is a

90^{\circ}

angle. A right angle is in the shape of a perfect corner, like the corner of a rectangular sheet of paper. Below is an example of a right angle.

Straight angles

A straight angle is a

180^{\circ}

angle. A straight angle looks like a straight line. Below is an example of a straight angle.

Acute angles

An acute angle is an angle whose degree measure is less than

90^{\circ}

. Below is an example of an acute angle.

When we compare an acute angle to a

right angle

, we can see that an acute angle is less than

90^{\circ}

Obtuse angles

An obtuse angle is an angle whose degree measure is greater than

90^{\circ}

but less than

180^{\circ}

. Below is an example of an obtuse angle.

When we compare an obtuse angle to a

right angle

, we can see that an obtuse angle is greater than

90^{\circ}

When we compare an obtuse angle to a

straight angle

, we can see that an obtuse angle is less than

180^{\circ}

Want to learn more about angle types? Check out this video.

Reflex angles

A reflex angle is an angle whose degree measure is greater than

180^{\circ}

but less than

360^{\circ}

. Below is an example of a reflex angle.

When we compare a reflex angle to a

straight angle

, we can see that a reflex angle is greater than

180^{\circ}

Complete angles

A complete angle is a

360^{\circ}

angle. A complete angle has both rays pointing the exact same direction. That is because we've turned a full circle from the first ray. Below is an example of a complete angle.

Practice set 1: Identify angles

Problem 1A

Is the following angle acute, right, obtuse, or straight?

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

Practice set 2: Angles in diagrams and images

Problem 2A

What type of angle is the angle highlighted in green below?

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

Practice set 3: Drawing angle types

Problem 3A

Drag the vertex of the angle to place the vertex at point $A$ ‍.

Drag another point on the angle to make one of the rays go through point $B$ ‍.

Make the other ray go through one of the unlabeled black points to create a straight angle.
The arc symbol near the vertex indicates the angle being measured.

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

Want to join the conversation?

Sort by:

haileymorris7404
Posted 7 years ago. Direct link to haileymorris7404's post “is there any angle that c...”
is there any angle that could be greater than 180 degrees?
Button navigates to signup pageComment on haileymorris7404's post “is there any angle that c...”
(74 votes)
Answer
- Maya Dutta
  Posted 5 years ago. Direct link to Maya Dutta's post “no. After 180 degrees it ...”
  no. After 180 degrees it starts bending backwards, and it would be a acute angle again. A circle equals 360 degrees though.
  Comment on Maya Dutta's post “no. After 180 degrees it ...”
  (13 votes)
EllieH
Posted 3 years ago. Direct link to EllieH's post “the last one confused me ...”
the last one confused me a little bit
Button navigates to signup pageComment on EllieH's post “the last one confused me ...”
(28 votes)
Answer
- D N
  Posted 2 years ago. Direct link to D N's post “Yeah it was very confusin...”
  Yeah it was very confusing
  Comment on D N's post “Yeah it was very confusin...”
  (24 votes)
Riley
Posted 6 years ago. Direct link to Riley's post “How is this "Right". Sayi...”
How is this "Right". Saying that everything around me is ATLEAST Right, Obtuse or strait? How and why? And if you go on drawing right, acute and obtuse angles then they don't let you make one how ever you want on the dots?
Button navigates to signup pageComment on Riley's post “How is this "Right". Sayi...”
(17 votes)
Answer
Haya ALNaimi
Posted 5 years ago. Direct link to Haya ALNaimi's post “Is there an angle over 72...”
Is there an angle over 720 degrees?
Button navigates to signup pageComment on Haya ALNaimi's post “Is there an angle over 72...”
(14 votes)
Answer
- Evan Lewis
  Posted 5 years ago. Direct link to Evan Lewis's post “Yes, angles can have any ...”
  Yes, angles can have any angle measure. But since there's only 360 degrees in a circle, we usually don't write angles any bigger than 360. A 720 degree angle is the same as a 360 degree angle.
  Comment on Evan Lewis's post “Yes, angles can have any ...”
  (11 votes)
Chenxiaomao6
Posted a year ago. Direct link to Chenxiaomao6's post “who likes math cuz i do”
who likes math cuz i do
Button navigates to signup pageComment on Chenxiaomao6's post “who likes math cuz i do”
(14 votes)
Answer
- Shreetree
  Posted 10 months ago. Direct link to Shreetree's post “I'm with you. I like math...”
  I'm with you. I like math.
  Comment on Shreetree's post “I'm with you. I like math...”
  (7 votes)
Edwin
Posted 3 years ago. Direct link to Edwin's post “I HAVE A JOKE how do u ke...”
I HAVE A JOKE how do u keep warm in the winter go to a corner its all was 90 digress.
Button navigates to signup pageComment on Edwin's post “I HAVE A JOKE how do u ke...”
(13 votes)
Answer
- HEHE
  Posted 3 months ago. Direct link to HEHE's post “u spelled degrees wrong”
  u spelled degrees wrong
  Comment on HEHE's post “u spelled degrees wrong”
  (4 votes)
31carter.matthews
Posted 4 years ago. Direct link to 31carter.matthews's post “hi am a new person for kh...”
hi am a new person for khan academy
Button navigates to signup pageComment on 31carter.matthews's post “hi am a new person for kh...”
(12 votes)
Answer
- Ainsley Zarn
  Posted a year ago. Direct link to Ainsley Zarn's post “so am I”
  so am I
  Comment on Ainsley Zarn's post “so am I”
  (4 votes)
3498
Posted 4 years ago. Direct link to 3498's post “Is a straight angle a 180...”
Is a straight angle a 180 degree angle
Button navigates to signup pageComment on 3498's post “Is a straight angle a 180...”
(10 votes)
Answer
- parkeropheim
  Posted 4 years ago. Direct link to parkeropheim's post “yes because 180 degree an...”
  yes because 180 degree angle is straight like a straight angle
  Comment on parkeropheim's post “yes because 180 degree an...”
  (9 votes)
Curtis
Posted 5 years ago. Direct link to Curtis's post “How am I supposed to know...”
How am I supposed to know what angle to make if it dosen't even tell me
Button navigates to signup pageComment on Curtis's post “How am I supposed to know...”
(7 votes)
Answer
- Yi Ji
  Posted 5 years ago. Direct link to Yi Ji's post “It already said what angl...”
  It already said what angle you need to make, which is a straight angle (180 degrees).
  Comment on Yi Ji's post “It already said what angl...”
  (9 votes)
DeAndre Walker
Posted 2 years ago. Direct link to DeAndre Walker's post “9+9 =18 but you add a zer...”
9+9 =18 but you add a zero
to 18 90+90 = 180
Button navigates to signup pageButton navigates to signup page
(8 votes)
Answer
- Mariam Ali
  Posted 2 years ago. Direct link to Mariam Ali's post “so true and right DeAndre...”
  so true and right DeAndre.
  Comment on Mariam Ali's post “so true and right DeAndre...”
  (4 votes)