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现把义务教育课程标准实验教科书《数学补充习题》(苏科版九年级上册)第87页第10题摘录如下:如图,扇形OAB的半径为6,AT切弧AB于点A,交OB的延长线于T,若AT=
The excerpt of the tenth question on the 87th page of the Compulsory Education Curriculum Standard Experimental Textbook (Suzhou Edition 9th Edition) is extracted as follows: As shown in the figure, the radius of the sector OAB is 6, and the AT arc AT is at the point A. The extension line is T, if AT=