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標題: Circles (1) [打印本頁]

作者: 得特星 時間: 2009-2-12 00:21 標題: Circles (1)

唔識, 唔該教教我

32. In Figure, APC,AQB and BRC are three semicircles. PB⊥AC. AQP and CRP are stright lines. AB = 8cm and BC = 18 cm.
(a) Show that PQBR is a rectangle.
(b) Show that QR is a common tangent to the two smaller semicircles.
(c) Find the length of QR.

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