CORRECTIONS TO KNOWN ERRORS

## in

GEOMETRY FOR COLLEGE STUDENTS

## by

I. Martin Isaacs

### Page 17,  in the hint to Exercise 1D.9:  Change  ‘C’  to  ‘B’.Page 21,  6 lines from bottom:   Change   ‘it it’  to  ‘it is’. Page 21,   last line:    Change ‘a = b’   to   ‘c = b’ .Page 22,   line 8:   Delete   ‘/2’.Page 23,   in Exercise 1E.2:   Change   ‘side BC of’  to  ‘base BC of isosceles’.Page 43,   line 5 of solution to Problem 1.30:   Change   ‘AC’  to  ‘BC’. Page 55,   line 7:    Change   ‘AHB’   to   ‘AHC’ . Page 104.  Exercise 3A.4 is wrong.   Replace it with this:    Show that each side of a triangle is one of its Simson lines. Page 116, 117 and 118:   The numbering of the exercises in Section 3C needs to be repaired. Page 118,  10 lines from bottom, in the note:   Change ‘D’   to   ‘C’. Page 123,  lines 10 and 11:   Change  ‘distances MS and MT are’   to   ‘MS2 and MT2 are’. Page 129,  line 15, near end of line:   Change   ‘mQ’   to   ‘mC’. Page 133,  7 lines from the bottom, in the third of the three displayed equations:   Change   ‘CR’  to   ‘CQ’   and also, change   ‘RA’  to   ‘QA’. Page 133,  3 lines from the bottom, following ‘and’ in the third equation:   make the same changes as above. Page 140,  line 8 of third paragraph:   Change   ‘perpendicularity to AC’  to   ‘perpendicularity to AB’. Page 142,  line 14:   Change   ‘ Corollary 9 ’  to   ‘ Corollary 10 ’. Page 150,  in the second paragraph following Theorem 4.16:   In line 2 of the paragraph, add a comma after ‘parallel’. Page 150,  in line 3 of the same paragraph:   Change   ‘4.18’  to   ‘4.19’. Page 153,  in the note following Exercise 4D.3:   Change   ‘Problem 3.16’   to   ‘Problem 3.17’. Page 168,  in first line of last paragraph:   Change   ‘Problem 5.8’   to   ‘Problem 5.9’. Page 170,  line 5:   Change   ‘KKBC’   to   ‘KXBC’. Page 171,  line 8:   Change   ‘the angle’   to   ‘the cosine of the angle’.Page 177,  in last line above the figure, the arrow over   ‘PQ’  should extend over both letters, and not just the  ‘P’.Page 179,  in the 7th from last line of the proof, there is a missing  ‘)’  just before ‘ =’.Page 187,  in Exercise 6A.5:   Change   ‘PBC’  to  ‘PAB’.Page 189,  3 lines from bottom:   Change   ‘BQ’  to  ‘BN’.Page 196,  in the last line before exercises:   Change  ‘6.17’  to  ‘6.16’.

IF YOU FIND OTHER ERRORS
PLEASE SEND E-MAIL TO
isaacs@math.wisc.edu