Hello Dr. Hanson, I'm so excited! Thank you for your lectures. I have a question on finding 3D moment in statics chapter 4. Please help me clarify my doubt. Oh yesss Dr. Jeff Hanson🎉🎉🎉❤
He's explicitly showing in the figure what angles we do have. There appear three equal angles called θ and he's just using conveniently sine and cosine for that angles. You can see using the bottom right one that sin(θ) = y/(1.5 m) and using the top one cos(θ) = y/(1.2 m) Therefore tan(θ) = sin(θ)/cos(θ) = [y/(1.5 m)]/[y/(1.2 m)] = [y/(1.5 m)](1.2 m)/y = 1.2/1.5 tan(θ) = 0.8
