题目

 Tom’s team is _______ 55 players while Mary’s _____ 70 players. A. consisted of; makes up             B. consisted of; makes up of C. made up; consists of                 D. made up of; consists of 答案：D如图，线段AB与⊙O相切于点C，连接OA，OB，OB交⊙O于点D，已知OA=OB=6，AB=6．（1）求⊙O的半径；（2）求图中阴影部分的面积．