Video Instruction     The Cartesian Coordinate System Section 1.1 An Intro to the Cartesian Coordinate System; Plotting points (5:00) Section 1.2 The Pythagorean Theorem; Pythagorean triples (5:40) Section 1.3 The Distance Formula (6:40) Section 1.4 Determining if three in the plane make up a right triangle (4:46) Section 1.5 Another example using the distance formula (6:33)