## Wednesday, 17 April 2013

### Circle Theorems & Hula Hoops!!

Inspired by @MrReddyMaths' guest blog post by @adrianjohnst on his blog my Y10 class have been creating Circle Theorems using Hula Hoops bought at 'Pound World' today!!

To see Adrian's blog post click http://mrreddy.com/blog/2012/12/guest-blog-circle-theorems-and-hula-hoops/

To visit the 'Pound World' website go to http://poundworld.net/. This lesson/blog post is part of my experimentation with #poundlandpedagogy.

This was our 1st lesson back after the Easter holidays and with a few personnel changes to the set due to recent mock results I felt it would be a good idea to revise over a few topics this week to get the class back into the swing of things and to provide links to the topics in the Unit 2 paper that we still need to cover. Another reason for looking at Circle Theorems again is because I didn't feel the class learnt enough when we covered them the first time round, the lesson, for whatever reason, didn't seem to sink in and so we needed to do more work here - the question/s that have come up in mock papers the class have done weren't fantastically well answered, as a whole group.

So, here's one I made earlier...

I used a few of my other purchases at 'Pound World' including the 'Memo Cube' 'post-its' (however these aren't sticky) and the masking tape to secure the rods.

The rods I got from our awesome D&T department. I luckily caught one of the NQT teachers in the car park and told him what I was planning to do - we then went to the D&T workshops and sliced up some wooden rods they had lying around so I could use these as the tangents, chords, radii, diameters etc! These were a great help and it pays to know all the departments in your school - you never know when you're going to need to call on them for help!

This 'model' then gave the class the basis of what I was looking for. After a short health and safety warning about splinters I gave the groups their hula hoop, wooden rods and sellotape/masking tape etc. At this point I had quite a few of our faculty in the room as I had invited them in if they were free to see what we were doing (and give me a hand). A few of them went and found us some extra sellotape as the masking tape wasn't great for holding the parts in place. Nonetheless, look what the class created...

Angles drawn from the same point
Angles drawn from the same chord
Angle in a semi-circle (angle at the circumference is half the angle at the centre)

Cyclic Quadrilateral (opposite angles = 180 degrees)

Angle at the circumference is half the angle at the centre

After the class had been given 15-20 minutes to complete their circle theorem hula hoops I asked one representative from each group to explain to the rest of the class what circle theorem they had done, explain the relative parts of each etc. I then collected them all in and handed out to the class a set of circle theorem past paper questions from the 'bland.in' website. The class then used my YouTube video and all the Theorems (now on the floor of the wall at the front of the class) to answer the questions. I was particularly impressed at this point that some of the class had got our previous lessons notes out of their exercise books to refer to too!

Here's all of them at the front of the class & the QR Codes sheet and questions I gave the class...

All of them, at the front as a reference - I just need to 'hang'/ put these up on one of the walls in the room for future use!
Here's the QR Code sheet I made the class. The centre QR Code links to the playlist on my YouTube Channel with all the explanations and some past paper question solutions. The 6 QR Codes round the centre one link to a specific theorem.

I (and I hope the class) really enjoyed this lesson. I feel they were much more secure with their knowledge of circle theorems at the end of the lesson having gone over the answers to the questions in the 'plenary'.
I know need some more Hula Hoops to do a session on Venn Diagrams (as suggested by a few of my Twitter followers following my #poundlandpedagogy tweets)!

1. Hi Mr. Collins - what a great idea, I think I shall have to pinch it!!!

I've never been a big fan of circle theorems, but now I've found a fun way to teach them (or at least consolidate/revise them) that may change.

Thanks again - a great idea!

J

www.amathsteacherwrites.co.uk

2. Great stuff Paul. What do they use to read the QR codes and watch the videos?

3. They just used their mobile phones/devices! So, naturally, some shared with others that didn't have these with them. Oh to have a class set available!

4. I had planned to use QR codes to link to revision clips for a wall display, then I saw your fantastic passport idea, then I was gutted that I didn't think of it first, then I was chuffed that I almost had a completely original thought! I was curious about a QR code our ICT dude had put in our newsletter, to sponsor him for a cycling challenge, which led me to thinking and learning how to use them and then it led me to you! Weird, we had the same inclination but came at it from different angles. Your passport idea is really superb!