Derive the trigonometric graphs using spaghetti!
If you’re looking for an interesting way of teaching the trigonometric graphs sine and cosine then you must watch this superb video of an activity to derive them using spaghetti. Chris Smith @aap03102 created this activity and then made the cheesy video explaining how to produce the spaghetti trig graphs.
Chris publishes a weekly maths newsletter that is a great read. To subscribe to it send him a quick email to firstname.lastname@example.org.
To follow up on the spaghetti activity, here is a great Geogebra applet that demonstrates the same ideas in an interactive way.