1. The problem statement, all variables and given/known data The orbits of Earth and Venus are so close to being circles that on the scale of the diagram below, you would not be able to tell they were not circles. a) Do you think the assumption that the orbits are circles has a significant effect on the result? b) Where in the calculations did we use the fact the orbits are circles? 2. Relevant equations http://i169.photobucket.com/albums/u234/kkaatthhyy/MATH.jpg 3. The attempt at a solution I have difficulty understanding this math problem.. can you guys help me? anyone? what do i have to find?