Can you sort these triangles into three different families and explain how you did it?
Are these statements relating to calculation and properties of shapes always true, sometimes true or never true?
What is the greatest number of counters you can place on the grid below without four of them lying at the corners of a square?
The ancient Egyptians were said to make right-angled triangles using a rope with twelve equal sections divided by knots. What other triangles could you make if you had a rope like this?