The farmers want to redraw their field boundary but keep the area the same. Can you advise them?
Imagine we have four bags containing numbers from a sequence. What numbers can we make now?
Slide the pieces to move Khun Phaen past all the guards into the position on the right from which he can escape to freedom.
Imagine you have an unlimited number of four types of triangle. How many different tetrahedra can you make?
Can you find a cuboid that has a surface area of exactly 100 square units. Is there more than one? Can you find them all?
Use a single sheet of A4 paper and make a cylinder having the greatest possible volume. The cylinder must be closed off by a circle at each end.
Experiment with the interactivity of "rolling" regular polygons, and explore how the different positions of the dot affects its vertical and horizontal movement at each stage.
An aluminium can contains 330 ml of cola. If the can's diameter is 6 cm what is the can's height?
