Massachusetts Curriculum Frameworks
7.G.B. Solve real-life and mathematical problems involving angle measure, area, surface area, and volume.
7.G.B.4. Circles and measurement:
7.G.B.4.b. Understand and describe the relationships among the radius, diameter, circumference and circumference of a circle.
7.G.B.4.d. Know the formulas for the area and circumference of a circle and use them to solve problems.