Analytic Geometry, Plane GeometryTwo lines rotate at the same speed around separate centers. Surprisingly, their intersection always outlines a circle that passes through the two pivot points. Their phase relation, indicated by the blue wedge, determines the size of the circle. A 90 degree offset puts the two pivot points at each end of a diameterComponente Curricular::Educação Superior::Ciências Exatas e da Terra::Matemática