DATE 
WEB LESSON 
CHANGE 
October 29, 2020 
Arithmetic and Geometric Sequences

Changed 12 to 12.5 (twice) in geometric series example.

October 19, 2020 
More on Exterior Angles in Triangles

Changed ‘with respect to $\,\angle C\,$’ to ‘with respect to the exterior angle at $\,\angle C\,$’.

October 17, 2020 
Practice with TwoColumn Proofs

Typo (two places): change ‘REASONS columns’ to ‘REASONS column’ (singular).

October 11, 2020 
Relationships Between Angles and Sides in Triangles

Typo: changed ‘$\,B\Leftarrow A\,$’ to ‘$\,A\Leftarrow B\,$ (that is, $\,B\Rightarrow A\,$)’.

October 11, 2020 
Triangle Congruence

Changed ‘alternately’ to ‘alternatively’.

October 11, 2020 
Angles:
Complementary, Supplementary, Vertical, and Linear Pairs

Removed the cursor from the vertical angle image.

October 3, 2020 
Introduction to the TwoColumn Proof 
Typo: changed ‘in written in’ to ‘is written in’.

October 3, 2020 
Proof Techniques 
Typo: changed ‘the only time than an’ to ‘the only time that an’.

September 28, 2020 
Quadrilaterals 
Changed ‘containing’ to ‘connecting’ in the definition of convex; much clearer. 
September 19, 2020 
More Practice with Function Notation 
Missing factor of $\,2\,$ in displayed equation; corrected in online (not print) version. 
September 14, 2020 
Finding Slant Asymptotes 
Added a ‘reallife’ example of a slant asymptote to online version, per user request. 
September 14, 2020 
Finding Vertical Asymptotes 
Added ‘reallife’ examples of vertical asymptotes to online version, per user request. 