Area of plane region, boundary, integral, vector fields, Green's theoremThe polar planimeter is a device that measures the area of a plane region by tracing out its boundary. The mechanism has two arms, a fixed anchor point, a freely moving elbow, a needle that traces the boundary of the region counterclockwise, and a wheel whose orientation is perpendicular to the elbow-to-needle arm. The net distance rolled by the wheel equals the area exactlyComponente Curricular::Educação Superior::Ciências Exatas e da Terra::Matemática