the corner of a field is seen a milkmaid milking a cow, and on the
other side of the field is the dairy where the extract has to be
Draw a line from the milking-stool down to the
river and thence to the door of the dairy, which shall indicate the
shortest possible route for the milkmaid.
It is quite easy
to indicate the exact spot on the bank of the river to which she should
direct her steps if she wants as short a walk as possible.
Can you find