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Can you sketch triangles that fit in the cells in this grid? Which ones are impossible? How do you know?
Here is a selection of different shapes. Can you work out which ones are triangles, and why?
Are these statements always true, sometimes true or never true?
This problem shows that the external angles of an irregular hexagon add to a circle.
This ladybird is taking a walk round a triangle. Can you see how much he has turned when he gets back to where he started?
Can you find all the different triangles on these peg boards, and find their angles?
How would you move the bands on the pegboard to alter these shapes?
How many DIFFERENT quadrilaterals can be made by joining the dots on the 8-point circle?
Can you match the Venn diagram with the Carroll diagram that shows the same information?
In this game, you turn over two cards and try to draw a triangle which has both properties.
Creating designs with squares - using the REPEAT command in LOGO. This requires some careful thought on angles
Use the interactivity to investigate what kinds of triangles can be drawn on peg boards with different numbers of pegs.
Ayah conjectures that the diagonals of a square meet at right angles. Do you agree? How could you find out?
The graph below is an oblique coordinate system based on 60 degree angles. It was drawn on isometric paper. What kinds of triangles do these points form?
Billy's class had a robot called Fred who could draw with chalk held underneath him. What shapes did the pupils make Fred draw?
How can the school caretaker be sure that the tree would miss the school buildings if it fell?