Serves them right really. When I bought mine I was disgusted to find some reference to using pythagoras theorem on something that was not even geometry related let alone anything to do with triangles. At the price I paid I considered that the least I should expect was a book not put together by idiots.
Reminds me of the advert Potterton were running some years back that featured a diaper-clad baby chalking out the general formula for solving a quadratic equation on a blackboard. Trouble is, the equation was wrong.
You can't get the staff you know.
