1. The problem statement, all variables and given/known data Calculate the knee joint angle based on the XY coordinates of the hip, knee and ankle joint centres. Hip joint(x = 1.0183, y = 0.7959) Knee joint(x = 1.1223, y = 0.5042) Ankle joint(x = 1.0539, y = 0.1081) 2. Relevant equations θjoint = θproximal −θdistal 3. The attempt at a solution Biomechanics student here. Not sure how to do this. I'm sure its a simple one just confused how to start. It is supposed to come out to 29.42 deg. Thanks for your help.