Pythagoras' Theorem & Trigonometry
Ladder and Cube
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?
Bendy Quad
Four rods are hinged at their ends to form a convex quadrilateral. Investigate the different shapes that the quadrilateral can take. Be patient this problem may be slow to load.
Compare Areas
Which has the greatest area, a circle or a square, inscribed in an isosceles right angle triangle?
Semi-detached
A square of area 40 square cms is inscribed in a semicircle. Find the area of the square that could be inscribed in a circle of the same radius.
Hexy-metry
A hexagon, with sides alternately a and b units in length, is inscribed in a circle. How big is the radius of the circle?
Three by One
There are many different methods to solve this geometrical problem - how many can you find?
Inscribed in a Circle
The area of a square inscribed in a circle with a unit radius is, satisfyingly, 2. What is the area of a regular hexagon inscribed in a circle with a unit radius?
Tilted Squares
It's easy to work out the areas of most squares that we meet, but what if they were tilted?
Far Horizon
An observer is on top of a lighthouse. How far from the foot of the lighthouse is the horizon that the observer can see?
The Spider and the Fly
A spider is sitting in the middle of one of the smallest walls in a room and a fly is resting beside the window. What is the shortest distance the spider would have to crawl to catch the fly?
Where to Land
Chris is enjoying a swim but needs to get back for lunch. How far along the bank should she land?
Cubestick
Stick some cubes together to make a cuboid. Find two of the angles by as many different methods as you can devise.
Where Is the Dot?
A dot starts at the point (1,0) and turns anticlockwise. Can you estimate the height of the dot after it has turned through 45 degrees? Can you calculate its height?
Garden Shed
Can you minimise the amount of wood needed to build the roof of my garden shed?