Two circles of equal size intersect and the centre of each circle is on the circumference of the other. What is the area of the intersection? Now imagine that the diagram represents two spheres of. . . .
Practice your skills of measurement and estimation using this interactive measurement tool based around fascinating images from biology.
Are these estimates of physical quantities accurate?
Can you work out the dimensions of the three cubes?
Scientist Bryan Rickett has a vision of the future - and it is one in which self-parking cars prowl the tarmac plains, hunting down suitable parking spots and manoeuvring elegantly into them.
Is it really greener to go on the bus, or to buy local?
A white cross is placed symmetrically in a red disc with the central square of side length sqrt 2 and the arms of the cross of length 1 unit. What is the area of the disc still showing?
Making a scale model of the solar system
Can you choose your units so that a cube has the same numerical value for it volume, surface area and total edge length?
From the measurements and the clue given find the area of the square that is not covered by the triangle and the circle.
Design and test a paper helicopter. What is the best design?