Here is a map showing the Serpentine Lake in London. It is claimed that the Serpentine covers an area of 40 acres. How can you test this claim? Looking at the shape differently… • What mathematical thinking can emerge when tackling this problem? • When might you choose to ask students to think about this problem? • What might you do next after using this problem with students? Cambridge Mathematics Education Project Sign up at http:// www.maths.cam.ac.uk/ about/community/ cmep/ http://cmep.maths.org/swanage • What mathematical thinking can emerge when tackling this problem? • When might you choose to ask students to think about this problem? • What might you do next after using this problem with students? Where to go next… Slippery slopes... another derivative