Contact us
Choose a category below so we can get back to you as quickly as possible.
因為是平行四邊形所以AB=CD;BC=AD..32-AB-CD=BC+AD.因為AB=CD;BC=AD.所以32-4-4=BC+BC.求出BC=12
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.