```
What's the angle between the red lines? pic.twitter.com/IXK5GfvM0N
— Will Feavyour (@NextLevelMaths) April 3, 2015
```

# MathArguments180.com

180 Days of Ideas for Discussion in Math Class. (as of 9July2014, we're in overtime!)

## Sunday, June 7, 2015

### 479: Dihedral Angle

## Saturday, June 6, 2015

### 478: Salinon Areas

source:

The Salinon was first introduced in the Book of Lemmas, a work attributed to Archimedes. http://t.co/crVrwtxeb8

— Cliff Pickover (@pickover) June 6, 2015

## Thursday, June 4, 2015

## Tuesday, June 2, 2015

### 476: Squares and Cubes

How is this problem

related to this one from a few days back?

related to this one from a few days back?

Is any square number times four another square number? |

## Sunday, May 31, 2015

### 475: Circle Theorems

Here are eight circle theorems, written by a Brit so you'll have to "translate" to American English ...

Are these the most important ones?

Are there any that are missing that you feel should be included in this group?

source:

Are these the most important ones?

Are there any that are missing that you feel should be included in this group?

source:

```
Circle Theorems - these are very important to learn for the Higher Tier pic.twitter.com/rG4KOwwixP
— Corbettmaths (@Corbettmaths) May 31, 2015
```

## Friday, May 29, 2015

### 473: Overlapping Squares

I might have posted this puzzle before.

What do your students think? Can they generalize it?

What is the overlapped area?

source:

What do your students think? Can they generalize it?

What is the overlapped area?

source:

```
As the red square is rotated around point O, what is the area of the overlap with the yellow square? #geomchat
— David Wees (@davidwees)
```

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