Quest of Nine

The Book

Reflection

This grid acts as if its axis (the line in its centre) is a mirror.

Click on a square its reflection is shown on the other side of the axis

Clear the grid

The grid below has a nine-sided irregular shape drawn in its second quadrant.

Reflection

Move your mouse pointer over the shape to see its reflection across the y axis.

Can you complete the statement below?

The co-ordinates of the vertices (corners) of the shape above are:

( -10, 4 ), ( -10, 5 ), ( -7, 8 ), ( -4, 8 ), (  ,  ), (  ,  ), (  ,  ), (  ,  ), (  ,  ).

Can you list the co-ordinates of the shape's reflection across the y axis?