Contact us
Choose a category below so we can get back to you as quickly as possible.
過圓心O′作y軸的垂線,垂足為D,連接O′A,∵O′D⊥BC,∴D為BC中點,∴BC=16-4=12,OD=6+4=10,∵⊙O′與x軸相切,∴O′A⊥x軸,∴四邊形OAO′D為矩形,半徑O′A=OD=10,∴直徑是20.故本題答案為:20.
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.