What I should be doing! |

**1)**Introduce the fact that each and every circle contains 360 degrees.

**2)**Have the students fold their coffee filter in half. Discuss that this is a straight angle. Ask, “How many degrees does it contain if it is one-half of a circle?” (180 degrees)

**3)**Have the students fold the coffee filter one more time, into fourths. Talk about this angle being called a right angle and that it contains 90 degrees. Ask, "What fractional part of a circle is this?"

**4)**Have the students use this fourth of a circle to locate places in the classroom where it will fit (e.g. the corner of their desk, a corner of a book, a corner of the board).

**5)**Explain that these corners are right angles and without right angles, we would live in a crooked world. Nothing would be straight!

__Linking Math and Literature for Older Students__Read

*Sir Cumference and the First Round Table (A Math Adventure) by Cindy Neuschwander.*This is a story about a clever knight of King Arthur’s named Sir Cumference. By using ideas offered by the knight’s wife, Lady Di of Ameter, and his son, Radius, King Arthur finds

Angles Resource |

Want more hands-on ideas for teaching angles? Check out

**Angles: Hands-On Geometry Activities.**

## 1 comment:

The coffee filters are a great idea. I do an activity with my 'first-day' geometry students every year where we find the center of a circle and then use paper folding to explore geometric shapes and their properties. I have always spent hours cutting out circles!

I highlighted your blog in a post today. I like to hear about the struggles you encounter. coremath912.blogspot.com/2012/01/what-i-read

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