Day 136: indirect measurement

I started off introducing the lesson using Dan Meyer’s idea here. Students had great debates about which triangles are useful in finding the height of the lamppost. Some students came to the board and drew triangles on the house in the background, or other random locations, then I asked, which of these triangles are similar? There was very productive discussions among the students & I just persisted with “explain that” and “how do you know” and “show me on the board.”

2014-04-24 09.10.21

The quote of the day was from Barbara:

2014-04-24 12.05.48

 

We then completed some examples in their interactive notebooks:

2014-04-24 09.34.50 2014-04-24 12.08.37 2014-04-24 12.08.55

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