So, you see, your rose-tree is not in the middle at all.
In the same way you can go on planting the old tree all over the
bed--anywhere you like. In every case you'll get those right angles in
the same ridiculous position--why, it makes me laugh _now_ to think of
it--and you'll be brought back to dear old CE.
And, of course, any point in CE _except_ F would divide CE unequally,
which I notice now is just what you've done yourself; so F is wrong
too.
But you see the idea?
What a mess you've made of the bed!