题目

如下图，已知⊙O的两条弦AC，BD相交于点E，∠A = 70o，∠C = 50o，那么sin∠AEB的值为          。  答案：解析:解：∵∠A=70°，∠c=50°，∴∠B=∠C=50°，∠AEB=60°，∴sin∠AEB=．故选D．考查了圆周角定理、三角形的内角和是180°，还要熟记特殊角的锐角三角函数值．  He was lucky enough to sell his car for exactly ______.   A. where he had paid for it          B. what he had paid for it   C. what he was paid for it           D. which he had paid for it