http://www.citytech.cuny.edu/mathematics/docs/review/MAT1275FinalReview.pdf
http://www.citytech.cuny.edu/mathematics/docs/review/MAT1275PerpendicularBisector.pdf
https://screencast-o-matic.com/watch/cbVvoaQPZ4
https://screencast-o-matic.com/watch/cbnVYfQRK8
Trigonometry Handbook¬_Copyright 2012‐2017, Earl Whitney, Reno NV. All Rights Reserved