Area under a curve and Trapezoidal Rule lesson for Calculus with guided notes, homework, and video lesson. Teach left, right, and midpoint rectangular approximation methods, Riemann sums, and area approximation.This is one lesson from my Calculus Unit 4 – Integration and Applications curriculum. It includes guided notes, homework practice, a full video lesson, and detailed step-by-step answer keys to support student understanding. This lesson is designed for a guided, non-AP Calculus course and