Let Γ and Γ′ be two congruent circles centered at O and O′, respectively, and let A be one of their two points of intersection. B is a point on Γ, C is the second point of intersection of AB and Γ′, and D is a point on Γ′ such that OBDO′ is a parallelogram. Show that the length of CD does not depend on the position of B. vectorgeometrygeometric transformationparallelogramtrapezoid