Contact us
Choose a category below so we can get back to you as quickly as possible.
過E點做直線EF垂直BC於F,則EF平行於AD,因為E點為中點,所以:EF=1/2AD,又因為角EBC=30度,AD垂直BC,所以EF=1/2BE,可推出AD=BE.
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.