Monday, November 9, 2009

Naming and Sorting Polygons by Angles

Happy Monday!


Today in class we began to talk about how to name triangles based on their angles.  We remembered that:


  • right angles are 90°
  • acute angles are less than 90°
  • obtuse angles are greater than 90°


We learned that we can measure the three angles (tri-angle...remember?) of a triangle to determine whether it is a right angle triangle, an acute angle triangle, or an obtuse angle triangle.  The rule is:


  • right angle triangles have one 90° angle
  • acute angle triangles have all 3 angles less than 90°
  • obtuse angle triangles have one angle greater than 90°


Remember: you can only have an acute triangle if all 3 angles are less than 90°.

Regular polygons are polygons (closed shape, at least 3 sides) that have all sides the same length, and all equal angles.  Irregular polygons have sides of different lengths, and different angles.

SUPER TERRIFIC BRAIN-BUSTING QUESTION:

WHAT KIND OF TRIANGLE IS A REGULAR POLYGON?  EXPLAIN YOUR ANSWER!
(First person to post the answer on the blog wins a prize in class tomorrow!)

See you tomorrow!

-Ms. Lewis.
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7 comments:

  1. deshaneNovember 9, 2009 at 4:02 PM

    ms lewis i dont have a patractor to do my home work

    ReplyDelete
  2. deshaneNovember 9, 2009 at 4:05 PM

    This comment has been removed by the author.

    ReplyDelete
  3. deshaneNovember 9, 2009 at 4:09 PM

    the anwser to the super terrific brain-busting question is a equalatiral triangle

    ReplyDelete
  4. Ms. LewisNovember 9, 2009 at 4:52 PM

    Nice one, Deshane! Prize for you tomorrow IF you explain why an equilateral triangle is a regular polygon.

    Don't worry about the protractor. I'll give you some time in class tomorrow to get it done.

    -Ms. Lewis.

    ReplyDelete
  5. deshaneNovember 10, 2009 at 3:15 PM

    the anwser to the super terrific brain-busting question is a equalatiral triangle becuse it has 3 equal side and all angles are equal that is the answer

    ReplyDelete
  6. AnonymousFebruary 3, 2010 at 4:03 PM

    hey Ms.lewis! srry 'bout the last minute question i forgot 2 bring it up at class, when u make intervals, is it used 2 make a bar graph or line graph?

    ReplyDelete
  7. Ms. LewisFebruary 3, 2010 at 4:07 PM

    No problem!

    You can use intervals for lots of kinds of graphs. In class, we have just only used intervals on bar graphs.

    Here's a big hint: If intervals are on the test (AND THEY ARE!!), you'll be using them to create a bar graph.

    Hope that helps!

    -Ms. Lewis.

    ReplyDelete

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