A 1 metre cube has one face on the ground and one face against a
wall. A 4 metre ladder leans against the wall and just touches the
cube. How high is the top of the ladder above the ground?
Straight lines are drawn from each corner of a square to the mid
points of the opposite sides. Express the area of the octagon that
is formed at the centre as a fraction of the area of the square.
Two cyclists, practising on a track, pass each other at the starting line and go at constant speeds... Can you find lap times that are such that the cyclists will meet exactly half way round the track.
Look at this square divided into four pieces: two identical triangles and two identical trapezia.
The square had side length 8 and area 64, but the area of the rectangle is 65 (13 by 5), how can the area have changed ?
And when you know what's happened, can you find any other similar problems?
(You might like to try cutting out the shapes from a piece of paper.)