This trig problem is confusing. How exactly is the radius of earth the distance between earth and the moon? Is there a proof for that or..

r/Trigonometry is a place for the discussion of trigonometry and its applications. Homework questions are allowed for the sake of learning, but please don't ask others to do all of your work for you. All content should be in English. Be civil, respectful, and follow the Reddiquette. Remember that the rules of reddit are also still in effect.