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# Close to Triangular

Here are the coordinates of nine points. It is possible to draw a triangle so that the shortest distance from each point to the triangle is at most one unit.

$(0, 0)$

$(8, 2)$

$(7, 8)$

$(170, 180)$

$(340, 360)$

$(2001, 1000)$

$(1500, 750)$

$(3000, 2000)$

$(4002, 2000)$

Can you find a suitable triangle? Is there more than one possibility?

Given three points, it is always possible to draw different triangles with edges passing through those three points - here are some examples of triangles going through the same three points:

Can you convince yourself that there are always infinitely many such triangles?

Here are some examples of different triangles going through the same set of four points:

Is it always possible to draw triangles through a set of four points, whatever their position?

Investigate some examples and explain your findings.

What happens when we try to draw triangles through five points?

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Age 14 to 16

Challenge Level

Here are the coordinates of nine points. It is possible to draw a triangle so that the shortest distance from each point to the triangle is at most one unit.

$(0, 0)$

$(8, 2)$

$(7, 8)$

$(170, 180)$

$(340, 360)$

$(2001, 1000)$

$(1500, 750)$

$(3000, 2000)$

$(4002, 2000)$

Can you find a suitable triangle? Is there more than one possibility?

Given three points, it is always possible to draw different triangles with edges passing through those three points - here are some examples of triangles going through the same three points:

Can you convince yourself that there are always infinitely many such triangles?

Here are some examples of different triangles going through the same set of four points:

Is it always possible to draw triangles through a set of four points, whatever their position?

Investigate some examples and explain your findings.

What happens when we try to draw triangles through five points?