Contact us
Choose a category below so we can get back to you as quickly as possible.
扇形弧長為120π×30180=20πcm;設圓錐的底面圓半徑為r,則r=20π2π=10cm.故答案為:10cm.
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.