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Find the missing coordinates which will form these eight quadrilaterals. These coordinates themselves will then form a shape with rotational and line symmetry.

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What are the coordinates of this shape after it has been transformed in the ways described? Compare these with the original coordinates. What do you notice about the numbers?

Coordinate Tan

Age 7 to 11 Challenge Level:

Here is a grid showing tangram pieces:

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What are the coordinates of the yellow dots that mark out the tangram? (We've numbered them so you can refer to them easily.)

Try changing the position of the origin by clicking on another place in the grid.

What happens to the coordinates now?