1. The problem statement, all variables and given/known data In circle O , BC >CD Compare x & y (which is greater?) 2. Relevant equations There are no eq. Rule: angle opposite larger side is larger 3. The attempt at a solution In my view both triangles are isosceles triangle. So x & y should be equal because they are both opposite the radius But book says a different answer. Some body please guide me. Zulfi.