![]() On page 243, Solution 1.50 is incomplete one also needs to check $A$, $P$, $W$ are collinear.On page 235, hint 556 doesn’t make sense.The correct sentence is: if the circumcircle of a cyclic quadrilateral is preserved, then so is the cross ratio of the cyclic quadrilateral. The last sentence is also wrong as written. On page 184, in Theorem 9.33, uniqueness is not true for (b) or (c).On page 159, in Lemma 8.16, change “fixes $B$ and $C$” to “swaps $B$ and $C$”.On page 146, Problem 7.52, change $\angle PCB$ to $\angle PBC$.(The result is still true, and the proof of part (b) is correct.) On page 107, the proof of part (a) of the theorem has several issues, and is probably best to just ignore. ![]()
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