F5 Maths

👨🏻‍🏫 學術台數學

Anonymous

2010-10-14 8:10 pm

Figure: http://img814.imageshack.us/img814/68/17867979.jpg

In the figure, AT is tangent to the circle at T and ABC is a straight line.
Find AT.

更新1:

Sorry, the figure should be here: http://img214.imageshack.us/img214/8046/81919587.jpg

回答 (1)

用戶2053

2010-10-14 9:20 pm

✔ 最佳答案

Where is T ??

Wrong figure ??

2010-10-14 13:20:06 補充：

圖片參考：http://img214.imageshack.us/img214/8046/81919587.jpg

ㄥACT = ㄥBTA (∠in alt. segment)

ㄥCAT = ㄥCAT (common)

△ATB ~ △ACT (A.A.)

AT/9 = (16 + 9)/AT

AT² = 9 * 25

AT = 15

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