Please copy these notes into your notebook for credit.
These are the notes for distance in the coordinate plane
This is a short video showing examples of slope, midpoint, and distance
Source: http://www.youtube.com/watch?v=B5cwSVCF5M0
This video breaks down the midpoint formula to its most basic concepts.
Source: https://www.khanacademy.org/math/trigonometry/graphs/midpoint_and_distance/v/midpoint-formula
This video shows how the distance formula is an extension of the Pythagorean theorem.
Source: https://www.khanacademy.org/math/trigonometry/graphs/midpoint_and_distance/v/distance-formula