Learning goals: Teacher Facing Critique (orally and in writing) claims about the radius, diameter, circumference, or area of a circle in a real-world situation. Decide whether to calculate the circumference or area of a circle to solve a problem in a real-world situation, and justify (orally) the decision. Estimate measurements of a circle in a real-world situation, and explain (orally and in writing) the estimation strategy. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from 7.3 Measuring Circles, Grade 7.