[Illustration]

CONSTRUCTION.--You know the eleventh hole? Well, let B be the tee,
and let C be the green, and let BC be my drive. Yes, _mine_. Is it
dead? Yes.

Now let BA be _your_ drive. I'm afraid you've pulled it a bit and gone
into the road by the farm.

You can't get on to the green by the direct route AC because you're
under the wall. You'll have to play further up the road till you get
opposite that gap at D. It's a pity, because you'll have to play about
the same distance, only in the wrong direction.

Take your niblick, then, and play your second, making AD equal to AC.
Now join CD.

I mean, put your third on the green. You can do that, _surely_? Good.

PROOF.--There, I'm down in two. But we won't rub it in. Do you notice
anything odd about these triangles? No? Well, the fact is that AD is
equal to AC, and the result of that is that the angle ACD is equal to
the angle ADC. That's Prop. 5. Anyhow, it's obvious, isn't it?

But steady on. The angle BCD is greater than its part, the angle
ACD--you must admit that? (Look out, there's a fellow going to drive.)

And therefore the angle BCD--Oh, well, I can't go into it all now or
it will mean we shall have to let these people through; but if you