Learning goals: Teacher Facing Apply the formula for area of a parallelogram to find the area, the length of the base, or the height, and explain (orally and in writing) the solution method. Choose which measurements to use for calculating the area of a parallelogram when more than one base or height measurement is given, and explain (orally and in writing) the choice. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from 6.1 Area and Surface Area, Grade 6.