Square It
Age 11 to 16
Challenge Level
Players take it in turns to choose a dot on the grid. The winner is the first to have four dots that can be joined to form a square.
Parallelogram It
Age 11 to 16
Challenge Level
Players take it in turns to choose a dot on the grid. The winner is the first to have four dots that can be joined to form a parallelogram.
Rhombus It
Age 11 to 16
Challenge Level
Players take it in turns to choose a dot on the grid. The winner is the first to have four dots that can be joined to form a rhombus.
Calculating with Cosines
Age 14 to 18
Challenge Level
If I tell you two sides of a right-angled triangle, you can easily work out the third. But what if the angle between the two sides is not a right angle?
T for Tan
Age 16 to 18
Challenge Level
Can you find a way to prove the trig identities using a diagram?
Trig Identity
Age 16 to 18
Challenge Level
In this short challenge, can you use angle properties in a circle to figure out some trig identities?
Loch Ness
Age 16 to 18
Challenge Level
Draw graphs of the sine and modulus functions and explain the humps.
Making Waves
Age 16 to 18
Challenge Level
Which is larger cos(sin x) or sin(cos x) ? Does this depend on x ?
NRICH is part of the family of activities in the Millennium Mathematics Project.