设A为圆周上的一个定点，在圆周上随机取一点与A连接，则弦长超过半径的概率为______．
在圆上其他位置任取一点B，设圆半径为R，
则B点位置所有情况对应的弧长为圆的周长2πR，
其中满足条件AB的长度大于等于半径长度的对应的弧长为
•2πR，2 3
则AB弦的长度大于等于半径长度的概率P=
=
•2πR2 3 2πR 2 3
故答案为：2 3
Italian Lakes and Greek Islands(12days) Prices starting from$1999 Your tour begins in Milan, Italy, and moves on to the pretty Italian Lake District and the attractive resort（胜地） of Stresa, your home for two nights. Collette Vacations has carefully chosen the Costa Victoria as your home away from home for your 7-night journey along the waterways of the Mediterranean. The cruise ship is filled with the warmth and culture of Italy and is richly designed with entertainment（娱乐） areas and very good living conditions. It will take you to the places of your dreams. You’ll spend 4 days touring Greek cities you’ve always heard about. In Katakolon, you will have the only unguided tour to nearby Olympia on the whole journey. Then with a local guide you will visit the Greek islands of Santorini, which is often related to the story of the lost city Atlantis, and Mykonos, a wonderful island with beautiful beaches. Your journey ends in Verona, home of the love story Romeo and Juliet, with a fun-filled farewell dinner--- a perfect ending to a pleasant journey. 12Days, 25 Meals, 10 Breakfasts, 6 Lunches, 9Dinners Day 1 Overnight fight to Italy Day 2-3 Regina Palace, Stresa, Italy Day4—10 Costa Victoria (Costa cruises) Day11 Hotel Leopardi, Verona, Italy Day12 Leave for home Please Note
|