Doodle note templates for tangent lines. I use this as a very basic introduction to tangent lines on the first day of AP Calculus. It's only meant to be a basic introduction to what they are, and a review of how to write equations of lines. It also covers using the line to make an approximation and drawing tangent lines. Students have no knowledge of derivatives therefore the slopes are given as equations. I usually supplement doodle notes with further examples and explanations as needed.