3題有關圓形的數學題...請智者們幫手

幅圖太細喇......

2007-01-28 17:16:24 補充：
你補充幅圖都係咁細......

2007-01-29 02:13:32 補充：
Assume length of OR as y, length of QR as x,and we have angle ORQ = angle ORP = 90degso OR^2 QR^2 = OQ^2 - (1)and OR^2 PR^2 = OP^2 - (2)

2007-01-29 02:13:43 補充：
From (1), we have y^2 x^2 = 5^2From (2), we have y^2 (2x)^2 = 13^2(2)-(1), we have 3x^2 = 144, i.e. x=sqrt48=4(sqrt3)So, the length of RT = the length of PR = 2x = 8(sqrt3)

你的圖太小啦！請你把圖放大好嗎？