Contact us
Choose a category below so we can get back to you as quickly as possible.
Rt△ABC中∠A=90°∠C=45°且BC=20 則AB=AC=10√2 BD是∠ABC的平分線 則△ABD與△EBD為相似三角形 即AD=DE,AB=BE 則△DEC的周長為CD+CE+DE=CD+AD+BC-BE=AC+BC-AB=BC=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.