Jun. 21st, 2012

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(Section 2.2, 2.3)

Aha! I knew they weren't doing the reading! Little rats! So today we talked about triangles, and introduced 'sum of interior angles is 180 degrees' and 'exterior angle equals sum of interior opposite angles'. The textbook has some lovely hands on demonstrations for these - for example take a paper triangle, tear off each angle, and rearrange them with the vertices together - and voila, you see that they add up to a straight line. There are a couple of other cute tricks, too. So I gave everyone a piece of paper, and asked them to turn it into any old triangle. Then I picked random people to show me how to use the triangle to 'prove' one of the facts - and no-one could do it! On the up side, when I demonstrated, they all went 'Oooh, I wish we'd done that when I was at school!'. I mentioned that I was expecting them to have read the necessary sections before each class, and they looked a bit bashful; we'll see how things go next week.

Then they worked on a couple of standard 'find the angle' problems, and presented solutions in groups. We need to talk about how to write solutions! I'm going to set aside a day next week for that, because what I saw made me wince (inside. Outwardly I like to think I was my usual calm, collected self. Rofl).

I'd photocopied a stack of designs with different symmetries for them to play with but we didn't get that far. My time management still needs work.

First homework handed in today. My plan is to grade it and email scans of the graded stuff back to the students, so that they can use it to prepare for the quiz on Monday. But right now, I need a nap. First week of teaching done, and I'm knackered.

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