Contact us
Choose a category below so we can get back to you as quickly as possible.
作L的平行線,使其到L的距離為3,記上面的為L1,下麵的為L2,問題即轉化為“當R為多少時圓與L1,L2的交點有且僅有3個,顯然R=8
We and our partners use cookies and other technologies to analyze traffic and optimize your experience. View more info and control your cookies settings at any time in our Cookies Policy.