Learning goals: Teacher Facing Calculate the volume of a cylinder and cone with the same radius and height, and justify (orally and in writing) that the volumes are an upper and lower bound for the volume of a hemisphere of the same radius. Estimate the volume of a hemisphere using the formulas for volume of a cone and cylinder, and explain (orally) the estimation strategy. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from 8.5 Functions and Volume, Grade 8.