Problem is at
http://www.flickr.com/photos/9886216@N05/8114351186/in/photostream
Thanks.
Problem is at
http://www.flickr.com/photos/9886216@N05/8114351186/in/photostream
Thanks.
• 半径为R,MN 交PO于S,则 OK=R^2/OP, KP=(OP^2-R^2)/OP, SP=1/2(OP^2-R^2). -jinjing- ♀ (62 bytes) () 11/12/2012 postreply 18:22:22