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Come and enlighten ----- urgent and so on expert! ! !

Drag drag de puppet2010-03-07 05:10:09 +0000 #1
Round o1, circle radius of o2, respectively R, r. Center of a circle distance is d, two from the outer circle. Point p in the circle on the campaign o1, o2 point q in the circle on the campaign. Q pq maximum and the minimum number of yes, why?
Barcelona fans2010-03-07 05:13:02 +0000 #2
pq maximum of d + R + r, the smallest to the largest dRr

pq yes, it can only be in two round was furthest away from the side and won two center of a circle, so you connect two center of a circle (center of a circle distance) to pay two round on four points, at both ends of the PQ = d + r + R, the middle of PQ = dRr
wzhy817172010-03-07 05:17:51 +0000 #3
it is difficult! ! !

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