Gabby put 5 points on a grid and labelled them `A` to `E`, as shown on the diagram below.
Point `A` is 35 millimetres from point `D.`
Gabby adds a sixth point, `F` so that the arrangement of points has one line of symmetry.
How far is point `F` from point `B?` (3 marks)
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`A\ text(to)\ D\ text(is 35 mm)`
`=> 1\ text(grid is 7 mm × 7 mm)`
`text(Point)\ F\ text(is added below:)`
`:.\ text(Distance)\ B\ text(to)\ F`
`= 6 xx 7`
`= 42\ text(mm)`