This magic square has only been partially completed. Can you still solve it...
Imagine cutting out a circle which is just contained inside a semicircle. What fraction of the semi-circle will remain?
Rotating a pencil twice about two different points gives surprising results...
If two of the sides of a right-angled triangle are 5cm and 6cm long, how many possibilities are there for the length of the third side?
Weekly Problem 38 - 2011
Given three concentric circles, shade in the annulus formed by the smaller two. What percentage of the larger circle is now shaded?
What does Pythagoras' Theorem tell you about the radius of these circles?
Weekly Problem 31 - 2014
Peri the winkle starts at the origin and slithers around some semicircles. Where does she end her expedition?
Can you make the numbers around each face of this solid add up to the same total?
A tetrahedron has each corner cut off to produce a solid. What is the total length of the edges of this solid?
What is the smallest number of colours needed to paint the faces of a regular octahedron so that no adjacent faces are the same colour?
