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標題:

F.4 maths

發問:

TA , TB and PR are tangents to the circle.TP=10cm,PR=7cm,RT=9cm,PA=x cm and RB=ycm.know that y-x=1. Hence find the values of x and y http://i240.photobucket.com/albums/ff164/walkinginthesang/43f71a0d.jpg?t=1196252471

最佳解答:

As follows: 圖片參考：http://i240.photobucket.com/albums/ff164/walkinginthesang/43f71a0d.jpg?t=1196252471 TB = TA ( tangent prop. ) So, 9 + y = 10 + x y - x = 1 --- ( 1 ) Then, PQ = PA = x and QR = RB = y ( tangent prop. ) So, x + y = 7 --- ( 2 ) ( 2 ) - ( 1 ): -2x = - 6 x = 3 y - 3 = 1 y = 4

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