University of Maryland Young Scholars Program The Young Scholars Program invites high school students with outstanding ability and promise to an amazing pre-college experience at the University of M
Dangerous Sports Around the world more and more people are taking part in danger ous sports and activities．Of course, there have always been people who have looked for adventure—those who have cli
外一点作圆
的两条切线，切点分别为
，则
的外接圆的方程为（ ）
B. 
D. 
