1. The problem statement, all variables and given/known data radii R₁, R₂, angular velocity ω₁, ω₂ 2. Relevant equations Two particles 1 and 2 describe co-planar concentric circles of radii R₁ and R₂ with angular velocities ω₁ and ω₂ as shown in the figure. Find the angular velocity of A with respect to B. 3. The attempt at a solution Θ will be constant as particles are moving with constant velocity. therefore, ω₁₂=(|V perpendicular|)/(vector R). But i am not sure whether i proceeded right. Please help.