Pythagoras' theorem

The sides of a triangle are 25, 39 and 40 units of length. Find the diameter of the circumscribed circle.

A ribbon runs around a box so that it makes a complete loop with two parallel pieces of ribbon on the top. How long will the ribbon be?

A fire-fighter needs to fill a bucket of water from the river and take it to a fire. What is the best point on the river bank for the fire-fighter to fill the bucket ?.

Three circular medallions fit in a rectangular box. Can you find the radius of the largest one?

Is the sum of the squares of two opposite sloping edges of a rectangular based pyramid equal to the sum of the squares of the other two sloping edges?

Medieval stonemasons used a method to construct octagons using ruler and compasses... Is the octagon regular? Proof please.

Find out how many pieces of hardboard of differing sizes can fit through a rectangular window.

Can you make a hypothesis to explain these ancient numbers?

Six circular discs are packed in different-shaped boxes so that the discs touch their neighbours and the sides of the box. Can you put the boxes in order according to the areas of their bases?

Find the ratio of the outer shaded area to the inner area for a six pointed star and an eight pointed star.