We are on lesson 1 and 2, which are vectors and kinematics only. We haven't covered anything else, yet the professor assigned us this problem. Can anybody help me? I have searched google and have yet to understand this problem. Thank you! To an observer on earth, the moon, which is 3.8x10^5 km away, substends an angle of 0.52 degrees. What is the moons diameter? 2. Relevant equations I found on google that S=R x theta 3. The attempt at a solution The answer is 3500 km, but no matter what configuration I put these values into the equation, I still don't get the right answer.