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標題:
F4 Maths 313
發問:
In the figure, AT is tangent to the circle at T and ABC is a straight line. Find AT. 圖片參考：http://imgcld.yimg.com/8/n/HA00149615/o/701112270020813873415610.jpg
最佳解答:
∠ ACT = ∠ BTA (∠in alt. segment)∠ CAT = ∠ CAT (common)△ATB ~ △ACT (AAA)AT/9 = (16 + 9)/ATAT2 = 9 * 25AT = 15
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