This shape comprises four semi-circles. What is the relationship between the area of the shaded region and the area of the circle on AB as diameter?
What shaped overlaps can you make with two circles which are the same size?
Change one equation in this pair of simultaneous equations very slightly and there is a big change in the solution. Why?
Cut differently-sized square corners from a square piece of paper to make boxes without lids. Do they all have the same volume?
In this town, houses are built with one room for each person. There are some families of seven people living in the town. In how many different ways can they build their houses?
