Thursday, February 24, 2011

All Polygons Have Angles: Acute, Right, or Obtuse!

In geometry, we are learning about angles!

An angle is a  figure formed when two rays share the same endpoint.

 We have learned about the three types of angles.
Below is a special angle called a right angle
It is also called a 90˚ angle.

Any angle less than a right angle is called an acute angle. 

Any angle greater than a right is called an obtuse angle. 

We have also learned that polygons are closed plane figures with straight sides and that all polygons have angles! 

Below is a quiz using our own artwork!
Can you guess the angle in each of our pictures?

Can You Name the Angle? on PhotoPeach

What angles have you found at home or outside?

What polygons have you found?

Have you found any acute, right, or obtuse triangles?

Would you like to try another quiz?  
Go to Mrs. Yollis' Name That Triangle Quiz!


  1. Dear Mrs. Ranney,

    Raelynn showed me the blog slide show about angles. I was very impressed with how much she new about angles. I really enjoyed watching it with her. I find the blogs are a very creative way of teaching the kids.

    Mrs. Lieber

  2. Dear Mrs. Ranney,

    I thought your video was very cool. I watched it with my family. It helps keep me sharp in learning geometry when you show different angles and I have to answer the question. To me, this is a fun way of learning.


  3. Dear Mrs. Ranney,

    I LOVED THE VIDEO! My polygon picture was "peaceful private polygon paradise" and I am enjoying making our polygon pictures out of only polygons. I found two different right angles in my house... my desk, and my wallet. I have been having fun exploring shapes in geometry.


  4. Dear Mrs. Ranney,

    Wow! That was an interesting way to learn geometry!

    Three of the polygons I found in my house were rectangles. They were my desk, a chocolate bar, and my bedroom door. At first, I thought that the island in my kitchen was a rectangle, but it turned out to be a octagon.

    The four sports banners on my wall are isosceles triangles with three acute angles. I also realized that our six kitchen shelves are shaped as right isosceles triangles. Finally, our floor design has two equilateral triangles and two isosceles triangles that have one obtuse angle each.

    After I explored our house, I found out that it is loaded with numerous polygons and angles.

    Your Student,

  5. We loved the music and we enjoy sharing in what you are all learning. My favorite subject in high school was geometry.
    Angles are almost everywhere but not in circles.
    Keep on learning! Fun fun!
    Aidan's Grammy

  6. Dear Mrs.Ranney,

    What a fantastic video!

    I love how you came up with a picture with only polygons in it, and it's so much fun doing that and seeing what people came up with! The title of my picture is called "Polygon Garden". I thought everyone's was very interesting. I love learning lots of new angles in geometry!


  7. Dear Mrs. Ranney,
    We are doing angles too. I was wondering what country you live in because so your class can look at our blog because my class thinks your blog is really cool.
    Sunnyland School - Room 12, Bellingham, WA

  8. Dear Mrs. Ranney,
    I think it’s really cool that your learning about polygons because I remember when I was learning polygons they where so much FUN!!!. But now we are learning about area and decimals. Also I loved the video I think it helped me a lot!!!


    Sunnyland School - Room 12, Bellingham, WA

  9. Mrs. Ranney,
    Your class is learning some very neat stuff. Angles and geometry are all around us like you stated. All around our house we have rectangles but we can not find any hexagons, octagons, or pentagons. Have any of you found any shapes that are not rectangles in your houses?

    Aidan's Aunt Nadia and Uncle Brett

  10. Dear Mrs. Ranney,

    I loved the slide show! I have found hundreds of right angles in my house. I've seen two right triangles on my pool fence.

    @ Class- Can you name letters that have a line of symmetry and a right angle? How many letters can you name that have a right angle?


  11. @ Uncle Brett and Auntie Nadia,

    We have a few octagons at our house. There is an octagon shaped window in my parent's bathroom. A second octagon is on the rug in their bathroom.

    Additionally, we have a square rug that has numerous right angles on it.

    Furthermore, we have a window in our living room that is square on the bottom and a semi-circle on the top of it.

    Thank you for visiting our blog and commenting.

    All the best,

  12. Dear Mrs. Ranney,
    I saw the video you made. I really like it. I figured out all of them. I love doing right angles,acute angles, and obtuse angles. I learned a trick. Obtuse means big and the angle is big. I hope you do another one!

    Natalie S.

  13. Dear Mrs. Ranney,
    Your angles video was very exquisite. It was very interesting how you made it so we could answer questions while you were wacthing the video :).



  14. Dear Mrs.Ranney's class,

    That video was so cool! I liked how you made it in to a quiz. I think you guys did an awsome job. Those angle finders were cool. Can't what till you guys wright on are blog.

    Mr. Avery's Class


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